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print_cmd.c
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print_cmd.c
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/* print_command -- A way to make readable commands from a command tree. */
/* Copyright (C) 1989-2022 Free Software Foundation, Inc.
This file is part of GNU Bash, the Bourne Again SHell.
Bash is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
Bash is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with Bash. If not, see <http://www.gnu.org/licenses/>.
*/
#include "config.h"
#include <stdio.h>
#if defined (HAVE_UNISTD_H)
# ifdef _MINIX
# include <sys/types.h>
# endif
# include <unistd.h>
#endif
#if defined (PREFER_STDARG)
# include <stdarg.h>
#else
# include <varargs.h>
#endif
#include "bashansi.h"
#include "bashintl.h"
#define NEED_XTRACE_SET_DECL
#include "shell.h"
#include "flags.h"
#include <y.tab.h> /* use <...> so we pick it up from the build directory */
#include "input.h"
#include "shmbutil.h"
#include "builtins/common.h"
#if !HAVE_DECL_PRINTF
extern int printf PARAMS((const char *, ...)); /* Yuck. Double yuck. */
#endif
static int indentation;
static int indentation_amount = 4;
#if defined (PREFER_STDARG)
typedef void PFUNC PARAMS((const char *, ...));
static void cprintf PARAMS((const char *, ...)) __attribute__((__format__ (printf, 1, 2)));
static void xprintf PARAMS((const char *, ...)) __attribute__((__format__ (printf, 1, 2)));
#else
#define PFUNC VFunction
static void cprintf ();
static void xprintf ();
#endif
static void reset_locals PARAMS((void));
static void newline PARAMS((char *));
static void indent PARAMS((int));
static void semicolon PARAMS((void));
static void the_printed_command_resize PARAMS((int));
static void make_command_string_internal PARAMS((COMMAND *));
static void _print_word_list PARAMS((WORD_LIST *, char *, PFUNC *));
static void command_print_word_list PARAMS((WORD_LIST *, char *));
static void print_case_clauses PARAMS((PATTERN_LIST *));
static void print_redirection_list PARAMS((REDIRECT *));
static void print_redirection PARAMS((REDIRECT *));
static void print_heredoc_header PARAMS((REDIRECT *));
static void print_heredoc_body PARAMS((REDIRECT *));
static void print_heredocs PARAMS((REDIRECT *));
static void print_heredoc_bodies PARAMS((REDIRECT *));
static void print_deferred_heredocs PARAMS((const char *));
static void print_for_command PARAMS((FOR_COM *));
#if defined (ARITH_FOR_COMMAND)
static void print_arith_for_command PARAMS((ARITH_FOR_COM *));
#endif
#if defined (SELECT_COMMAND)
static void print_select_command PARAMS((SELECT_COM *));
#endif
static void print_group_command PARAMS((GROUP_COM *));
static void print_case_command PARAMS((CASE_COM *));
static void print_while_command PARAMS((WHILE_COM *));
static void print_until_command PARAMS((WHILE_COM *));
static void print_until_or_while PARAMS((WHILE_COM *, char *));
static void print_if_command PARAMS((IF_COM *));
#if defined (COND_COMMAND)
static void print_cond_node PARAMS((COND_COM *));
#endif
static void print_function_def PARAMS((FUNCTION_DEF *));
#define PRINTED_COMMAND_INITIAL_SIZE 64
#define PRINTED_COMMAND_GROW_SIZE 128
char *the_printed_command = (char *)NULL;
int the_printed_command_size = 0;
int command_string_index = 0;
int xtrace_fd = -1;
FILE *xtrace_fp = 0;
#define CHECK_XTRACE_FP xtrace_fp = (xtrace_fp ? xtrace_fp : stderr)
/* shell expansion characters: used in print_redirection_list */
#define EXPCHAR(c) ((c) == '{' || (c) == '~' || (c) == '$' || (c) == '`')
#define PRINT_DEFERRED_HEREDOCS(x) \
do { \
if (deferred_heredocs) \
print_deferred_heredocs (x); \
} while (0)
/* Non-zero means the stuff being printed is inside of a function def. */
static int inside_function_def;
static int skip_this_indent;
static int was_heredoc;
static int printing_connection;
static int printing_comsub;
static REDIRECT *deferred_heredocs;
/* The depth of the group commands that we are currently printing. This
includes the group command that is a function body. */
static int group_command_nesting;
/* A buffer to indicate the indirection level (PS4) when set -x is enabled. */
static char *indirection_string = 0;
static int indirection_stringsiz = 0;
/* Print COMMAND (a command tree) on standard output. */
void
print_command (command)
COMMAND *command;
{
command_string_index = 0;
printf ("%s", make_command_string (command));
}
/* Make a string which is the printed representation of the command
tree in COMMAND. We return this string. However, the string is
not consed, so you have to do that yourself if you want it to
remain around. */
char *
make_command_string (command)
COMMAND *command;
{
command_string_index = was_heredoc = 0;
deferred_heredocs = 0;
make_command_string_internal (command);
return (the_printed_command);
}
/* Print a command substitution after parsing it in parse_comsub to turn it
back into an external representation without turning newlines into `;'.
Placeholder for other changes, if any are necessary. */
char *
print_comsub (command)
COMMAND *command;
{
char *ret;
printing_comsub++;
ret = make_command_string (command);
printing_comsub--;
return ret;
}
/* The internal function. This is the real workhorse. */
static void
make_command_string_internal (command)
COMMAND *command;
{
char s[3];
if (command == 0)
cprintf ("");
else
{
if (skip_this_indent)
skip_this_indent--;
else
indent (indentation);
if (command->flags & CMD_TIME_PIPELINE)
{
cprintf ("time ");
if (command->flags & CMD_TIME_POSIX)
cprintf ("-p ");
}
if (command->flags & CMD_INVERT_RETURN)
cprintf ("! ");
switch (command->type)
{
case cm_for:
print_for_command (command->value.For);
break;
#if defined (ARITH_FOR_COMMAND)
case cm_arith_for:
print_arith_for_command (command->value.ArithFor);
break;
#endif
#if defined (SELECT_COMMAND)
case cm_select:
print_select_command (command->value.Select);
break;
#endif
case cm_case:
print_case_command (command->value.Case);
break;
case cm_while:
print_while_command (command->value.While);
break;
case cm_until:
print_until_command (command->value.While);
break;
case cm_if:
print_if_command (command->value.If);
break;
#if defined (DPAREN_ARITHMETIC)
case cm_arith:
print_arith_command (command->value.Arith->exp);
break;
#endif
#if defined (COND_COMMAND)
case cm_cond:
print_cond_command (command->value.Cond);
break;
#endif
case cm_simple:
print_simple_command (command->value.Simple);
break;
case cm_connection:
skip_this_indent++;
printing_connection++;
make_command_string_internal (command->value.Connection->first);
switch (command->value.Connection->connector)
{
case '&':
case '|':
{
char c = command->value.Connection->connector;
s[0] = ' ';
s[1] = c;
s[2] = '\0';
print_deferred_heredocs (s);
if (c != '&' || command->value.Connection->second)
{
cprintf (" ");
skip_this_indent++;
}
}
break;
case AND_AND:
print_deferred_heredocs (" && ");
if (command->value.Connection->second)
skip_this_indent++;
break;
case OR_OR:
print_deferred_heredocs (" || ");
if (command->value.Connection->second)
skip_this_indent++;
break;
case ';':
case '\n': /* special case this */
{
char c = command->value.Connection->connector;
int was_newline;
s[0] = printing_comsub ? c : ';';
s[1] = '\0';
was_newline = deferred_heredocs == 0 && was_heredoc == 0 && c == '\n';
if (deferred_heredocs == 0)
{
if (was_heredoc == 0)
cprintf ("%s", s); /* inside_function_def? */
else
was_heredoc = 0;
}
else
/* print_deferred_heredocs special-cases `;' */
print_deferred_heredocs (inside_function_def ? "" : ";");
if (inside_function_def)
cprintf ("\n");
else if (printing_comsub && c == '\n' && was_newline == 0)
cprintf ("\n"); /* preserve newlines in comsubs but don't double them */
else
{
if (c == ';')
cprintf (" ");
if (command->value.Connection->second)
skip_this_indent++;
}
break;
}
default:
cprintf (_("print_command: bad connector `%d'"),
command->value.Connection->connector);
break;
}
make_command_string_internal (command->value.Connection->second);
PRINT_DEFERRED_HEREDOCS ("");
printing_connection--;
break;
case cm_function_def:
print_function_def (command->value.Function_def);
break;
case cm_group:
print_group_command (command->value.Group);
break;
case cm_subshell:
cprintf ("( ");
skip_this_indent++;
make_command_string_internal (command->value.Subshell->command);
PRINT_DEFERRED_HEREDOCS ("");
cprintf (" )");
break;
case cm_coproc:
cprintf ("coproc ");
if (command->value.Coproc->command->type != cm_simple)
cprintf ("%s ", command->value.Coproc->name);
skip_this_indent++;
make_command_string_internal (command->value.Coproc->command);
break;
default:
command_error ("print_command", CMDERR_BADTYPE, command->type, 0);
break;
}
if (command->redirects)
{
cprintf (" ");
print_redirection_list (command->redirects);
}
}
}
static void
_print_word_list (list, separator, pfunc)
WORD_LIST *list;
char *separator;
PFUNC *pfunc;
{
WORD_LIST *w;
for (w = list; w; w = w->next)
(*pfunc) ("%s%s", w->word->word, w->next ? separator : "");
}
void
print_word_list (list, separator)
WORD_LIST *list;
char *separator;
{
_print_word_list (list, separator, xprintf);
}
void
xtrace_set (fd, fp)
int fd;
FILE *fp;
{
if (fd >= 0 && sh_validfd (fd) == 0)
{
internal_error (_("xtrace_set: %d: invalid file descriptor"), fd);
return;
}
if (fp == 0)
{
internal_error (_("xtrace_set: NULL file pointer"));
return;
}
if (fd >= 0 && fileno (fp) != fd)
internal_warning (_("xtrace fd (%d) != fileno xtrace fp (%d)"), fd, fileno (fp));
xtrace_fd = fd;
xtrace_fp = fp;
}
void
xtrace_init ()
{
xtrace_set (-1, stderr);
}
void
xtrace_reset ()
{
if (xtrace_fd >= 0 && xtrace_fp)
{
fflush (xtrace_fp);
fclose (xtrace_fp);
}
else if (xtrace_fd >= 0)
close (xtrace_fd);
xtrace_fd = -1;
xtrace_fp = stderr;
}
void
xtrace_fdchk (fd)
int fd;
{
if (fd == xtrace_fd)
xtrace_reset ();
}
/* Return a string denoting what our indirection level is. */
char *
indirection_level_string ()
{
register int i, j;
char *ps4;
char ps4_firstc[MB_LEN_MAX+1];
int ps4_firstc_len, ps4_len, ineed, old;
ps4 = get_string_value ("PS4");
if (indirection_string == 0)
indirection_string = xmalloc (indirection_stringsiz = 100);
indirection_string[0] = '\0';
if (ps4 == 0 || *ps4 == '\0')
return (indirection_string);
old = change_flag ('x', FLAG_OFF);
ps4 = decode_prompt_string (ps4);
if (old)
change_flag ('x', FLAG_ON);
if (ps4 == 0 || *ps4 == '\0')
{
FREE (ps4);
return (indirection_string);
}
#if defined (HANDLE_MULTIBYTE)
ps4_len = strnlen (ps4, MB_CUR_MAX);
ps4_firstc_len = MBLEN (ps4, ps4_len);
if (ps4_firstc_len == 1 || ps4_firstc_len == 0 || ps4_firstc_len < 0)
{
ps4_firstc[0] = ps4[0];
ps4_firstc[ps4_firstc_len = 1] = '\0';
}
else
memcpy (ps4_firstc, ps4, ps4_firstc_len);
#else
ps4_firstc[0] = ps4[0];
ps4_firstc[ps4_firstc_len = 1] = '\0';
#endif
/* Dynamically resize indirection_string so we have room for everything
and we don't have to truncate ps4 */
ineed = (ps4_firstc_len * indirection_level) + strlen (ps4);
if (ineed > indirection_stringsiz - 1)
{
indirection_stringsiz = ineed + 1;
indirection_string = xrealloc (indirection_string, indirection_stringsiz);
}
for (i = j = 0; ps4_firstc[0] && j < indirection_level && i < indirection_stringsiz - 1; i += ps4_firstc_len, j++)
{
if (ps4_firstc_len == 1)
indirection_string[i] = ps4_firstc[0];
else
memcpy (indirection_string+i, ps4_firstc, ps4_firstc_len);
}
for (j = ps4_firstc_len; *ps4 && ps4[j] && i < indirection_stringsiz - 1; i++, j++)
indirection_string[i] = ps4[j];
indirection_string[i] = '\0';
free (ps4);
return (indirection_string);
}
void
xtrace_print_assignment (name, value, assign_list, xflags)
char *name, *value;
int assign_list, xflags;
{
char *nval;
CHECK_XTRACE_FP;
if (xflags)
fprintf (xtrace_fp, "%s", indirection_level_string ());
/* VALUE should not be NULL when this is called. */
if (*value == '\0' || assign_list)
nval = value;
else if (sh_contains_shell_metas (value))
nval = sh_single_quote (value);
else if (ansic_shouldquote (value))
nval = ansic_quote (value, 0, (int *)0);
else
nval = value;
if (assign_list)
fprintf (xtrace_fp, "%s=(%s)\n", name, nval);
else
fprintf (xtrace_fp, "%s=%s\n", name, nval);
if (nval != value)
FREE (nval);
fflush (xtrace_fp);
}
/* A function to print the words of a simple command when set -x is on. Also used to
print the word list in a for or select command header; in that case, we suppress
quoting the words because they haven't been expanded yet. XTFLAGS&1 means to
print $PS4; XTFLAGS&2 means to suppress quoting the words in LIST. */
void
xtrace_print_word_list (list, xtflags)
WORD_LIST *list;
int xtflags;
{
WORD_LIST *w;
char *t, *x;
CHECK_XTRACE_FP;
if (xtflags&1)
fprintf (xtrace_fp, "%s", indirection_level_string ());
for (w = list; w; w = w->next)
{
t = w->word->word;
if (t == 0 || *t == '\0')
fprintf (xtrace_fp, "''%s", w->next ? " " : "");
else if (xtflags & 2)
fprintf (xtrace_fp, "%s%s", t, w->next ? " " : "");
else if (sh_contains_shell_metas (t))
{
x = sh_single_quote (t);
fprintf (xtrace_fp, "%s%s", x, w->next ? " " : "");
free (x);
}
else if (ansic_shouldquote (t))
{
x = ansic_quote (t, 0, (int *)0);
fprintf (xtrace_fp, "%s%s", x, w->next ? " " : "");
free (x);
}
else
fprintf (xtrace_fp, "%s%s", t, w->next ? " " : "");
}
fprintf (xtrace_fp, "\n");
fflush (xtrace_fp);
}
static void
command_print_word_list (list, separator)
WORD_LIST *list;
char *separator;
{
_print_word_list (list, separator, cprintf);
}
void
print_for_command_head (for_command)
FOR_COM *for_command;
{
cprintf ("for %s in ", for_command->name->word);
command_print_word_list (for_command->map_list, " ");
}
void
xtrace_print_for_command_head (for_command)
FOR_COM *for_command;
{
CHECK_XTRACE_FP;
fprintf (xtrace_fp, "%s", indirection_level_string ());
fprintf (xtrace_fp, "for %s in ", for_command->name->word);
xtrace_print_word_list (for_command->map_list, 2);
}
static void
print_for_command (for_command)
FOR_COM *for_command;
{
print_for_command_head (for_command);
cprintf (";");
newline ("do\n");
indentation += indentation_amount;
make_command_string_internal (for_command->action);
PRINT_DEFERRED_HEREDOCS ("");
semicolon ();
indentation -= indentation_amount;
newline ("done");
}
#if defined (ARITH_FOR_COMMAND)
static void
print_arith_for_command (arith_for_command)
ARITH_FOR_COM *arith_for_command;
{
cprintf ("for ((");
command_print_word_list (arith_for_command->init, " ");
cprintf ("; ");
command_print_word_list (arith_for_command->test, " ");
cprintf ("; ");
command_print_word_list (arith_for_command->step, " ");
cprintf ("))");
newline ("do\n");
indentation += indentation_amount;
make_command_string_internal (arith_for_command->action);
PRINT_DEFERRED_HEREDOCS ("");
semicolon ();
indentation -= indentation_amount;
newline ("done");
}
#endif /* ARITH_FOR_COMMAND */
#if defined (SELECT_COMMAND)
void
print_select_command_head (select_command)
SELECT_COM *select_command;
{
cprintf ("select %s in ", select_command->name->word);
command_print_word_list (select_command->map_list, " ");
}
void
xtrace_print_select_command_head (select_command)
SELECT_COM *select_command;
{
CHECK_XTRACE_FP;
fprintf (xtrace_fp, "%s", indirection_level_string ());
fprintf (xtrace_fp, "select %s in ", select_command->name->word);
xtrace_print_word_list (select_command->map_list, 2);
}
static void
print_select_command (select_command)
SELECT_COM *select_command;
{
print_select_command_head (select_command);
cprintf (";");
newline ("do\n");
indentation += indentation_amount;
make_command_string_internal (select_command->action);
PRINT_DEFERRED_HEREDOCS ("");
semicolon ();
indentation -= indentation_amount;
newline ("done");
}
#endif /* SELECT_COMMAND */
static void
print_group_command (group_command)
GROUP_COM *group_command;
{
group_command_nesting++;
cprintf ("{ ");
if (inside_function_def == 0)
skip_this_indent++;
else
{
/* This is a group command { ... } inside of a function
definition, and should be printed as a multiline group
command, using the current indentation. */
cprintf ("\n");
indentation += indentation_amount;
}
make_command_string_internal (group_command->command);
PRINT_DEFERRED_HEREDOCS ("");
if (inside_function_def)
{
cprintf ("\n");
indentation -= indentation_amount;
indent (indentation);
}
else
{
semicolon ();
cprintf (" ");
}
cprintf ("}");
group_command_nesting--;
}
void
print_case_command_head (case_command)
CASE_COM *case_command;
{
cprintf ("case %s in ", case_command->word->word);
}
void
xtrace_print_case_command_head (case_command)
CASE_COM *case_command;
{
CHECK_XTRACE_FP;
fprintf (xtrace_fp, "%s", indirection_level_string ());
fprintf (xtrace_fp, "case %s in\n", case_command->word->word);
}
static void
print_case_command (case_command)
CASE_COM *case_command;
{
print_case_command_head (case_command);
if (case_command->clauses)
print_case_clauses (case_command->clauses);
newline ("esac");
}
static void
print_case_clauses (clauses)
PATTERN_LIST *clauses;
{
indentation += indentation_amount;
while (clauses)
{
newline ("");
command_print_word_list (clauses->patterns, " | ");
cprintf (")\n");
indentation += indentation_amount;
make_command_string_internal (clauses->action);
indentation -= indentation_amount;
PRINT_DEFERRED_HEREDOCS ("");
if (clauses->flags & CASEPAT_FALLTHROUGH)
newline (";&");
else if (clauses->flags & CASEPAT_TESTNEXT)
newline (";;&");
else
newline (";;");
clauses = clauses->next;
}
indentation -= indentation_amount;
}
static void
print_while_command (while_command)
WHILE_COM *while_command;
{
print_until_or_while (while_command, "while");
}
static void
print_until_command (while_command)
WHILE_COM *while_command;
{
print_until_or_while (while_command, "until");
}
static void
print_until_or_while (while_command, which)
WHILE_COM *while_command;
char *which;
{
cprintf ("%s ", which);
skip_this_indent++;
make_command_string_internal (while_command->test);
PRINT_DEFERRED_HEREDOCS ("");
semicolon ();
cprintf (" do\n"); /* was newline ("do\n"); */
indentation += indentation_amount;
make_command_string_internal (while_command->action);
PRINT_DEFERRED_HEREDOCS ("");
indentation -= indentation_amount;
semicolon ();
newline ("done");
}
static void
print_if_command (if_command)
IF_COM *if_command;
{
cprintf ("if ");
skip_this_indent++;
make_command_string_internal (if_command->test);
semicolon ();
cprintf (" then\n");
indentation += indentation_amount;
make_command_string_internal (if_command->true_case);
PRINT_DEFERRED_HEREDOCS ("");
indentation -= indentation_amount;
if (if_command->false_case)
{
semicolon ();
newline ("else\n");
indentation += indentation_amount;
make_command_string_internal (if_command->false_case);
PRINT_DEFERRED_HEREDOCS ("");
indentation -= indentation_amount;
}
semicolon ();
newline ("fi");
}
#if defined (DPAREN_ARITHMETIC) || defined (ARITH_FOR_COMMAND)
void
print_arith_command (arith_cmd_list)
WORD_LIST *arith_cmd_list;
{
cprintf ("((");
command_print_word_list (arith_cmd_list, " ");
cprintf ("))");
}
#endif
#if defined (COND_COMMAND)
static void
print_cond_node (cond)
COND_COM *cond;
{
if (cond->flags & CMD_INVERT_RETURN)
cprintf ("! ");
if (cond->type == COND_EXPR)
{
cprintf ("( ");
print_cond_node (cond->left);
cprintf (" )");
}
else if (cond->type == COND_AND)
{
print_cond_node (cond->left);
cprintf (" && ");
print_cond_node (cond->right);
}
else if (cond->type == COND_OR)
{
print_cond_node (cond->left);
cprintf (" || ");
print_cond_node (cond->right);
}
else if (cond->type == COND_UNARY)
{
cprintf ("%s", cond->op->word);
cprintf (" ");
print_cond_node (cond->left);
}
else if (cond->type == COND_BINARY)
{
print_cond_node (cond->left);
cprintf (" ");
cprintf ("%s", cond->op->word);
cprintf (" ");
print_cond_node (cond->right);
}
else if (cond->type == COND_TERM)
{
cprintf ("%s", cond->op->word); /* need to add quoting here */
}
}
void
print_cond_command (cond)
COND_COM *cond;
{
cprintf ("[[ ");
print_cond_node (cond);
cprintf (" ]]");
}
#ifdef DEBUG
void
debug_print_word_list (s, list, sep)
char *s;
WORD_LIST *list;
char *sep;
{
WORD_LIST *w;
if (s)
fprintf (stderr, "%s: ", s);
for (w = list; w; w = w->next)
fprintf (stderr, "%s%s", w->word->word, w->next ? sep : "");
fprintf (stderr, "\n");
}
void
debug_print_cond_command (cond)
COND_COM *cond;
{
fprintf (stderr, "DEBUG: ");
command_string_index = 0;
print_cond_command (cond);
fprintf (stderr, "%s\n", the_printed_command);
}
#endif
void
xtrace_print_cond_term (type, invert, op, arg1, arg2)
int type, invert;
WORD_DESC *op;
char *arg1, *arg2;
{
CHECK_XTRACE_FP;
command_string_index = 0;
fprintf (xtrace_fp, "%s", indirection_level_string ());
fprintf (xtrace_fp, "[[ ");
if (invert)
fprintf (xtrace_fp, "! ");
if (type == COND_UNARY)
{
fprintf (xtrace_fp, "%s ", op->word);
fprintf (xtrace_fp, "%s", (arg1 && *arg1) ? arg1 : "''");
}
else if (type == COND_BINARY)
{
fprintf (xtrace_fp, "%s", (arg1 && *arg1) ? arg1 : "''");
fprintf (xtrace_fp, " %s ", op->word);
fprintf (xtrace_fp, "%s", (arg2 && *arg2) ? arg2 : "''");
}
fprintf (xtrace_fp, " ]]\n");
fflush (xtrace_fp);
}
#endif /* COND_COMMAND */
#if defined (DPAREN_ARITHMETIC) || defined (ARITH_FOR_COMMAND)
/* A function to print the words of an arithmetic command when set -x is on. */
void
xtrace_print_arith_cmd (list)
WORD_LIST *list;
{
WORD_LIST *w;
CHECK_XTRACE_FP;
fprintf (xtrace_fp, "%s", indirection_level_string ());
fprintf (xtrace_fp, "(( ");
for (w = list; w; w = w->next)
fprintf (xtrace_fp, "%s%s", w->word->word, w->next ? " " : "");
fprintf (xtrace_fp, " ))\n");
fflush (xtrace_fp);
}
#endif
void
print_simple_command (simple_command)
SIMPLE_COM *simple_command;
{
if (simple_command->words)
command_print_word_list (simple_command->words, " ");
if (simple_command->redirects)
{
if (simple_command->words)
cprintf (" ");