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/* chmod.c - Change file mode bits
* Copyright 2012 Rob Landley <>
* See
USE_CHMOD(NEWTOY(chmod, "<2?vRf[-vf]", TOYFLAG_BIN))
config CHMOD
bool "chmod"
default y
usage: chmod [-R] MODE FILE...
Change mode of listed file[s] (recursively with -R).
MODE can be (comma-separated) stanzas: [ugoa][+-=][rwxstXugo]
Stanzas are applied in order: For each category (u = user,
g = group, o = other, a = all three, if none specified default is a),
set (+), clear (-), or copy (=), r = read, w = write, x = execute.
s = u+s = suid, g+s = sgid, o+s = sticky. (+t is an alias for o+s).
suid/sgid: execute as the user/group who owns the file.
sticky: can't delete files you don't own out of this directory
X = x for directories or if any category already has x set.
Or MODE can be an octal value up to 7777 ug uuugggooo top +
bit 1 = o+x, bit 1<<8 = u+w, 1<<11 = g+1 sstrwxrwxrwx bottom
chmod u+w file - allow owner of "file" to write to it.
chmod 744 file - user can read/write/execute, everyone else read only
#define FOR_chmod
#include "toys.h"
char *mode;
static int do_chmod(struct dirtree *try)
mode_t mode;
if (!dirtree_notdotdot(try)) return 0;
mode = string_to_mode(TT.mode, try->st.st_mode);
if (toys.optflags & FLAG_v) {
char *s = dirtree_path(try, 0);
printf("chmod '%s' to %04o\n", s, mode);
wfchmodat(dirtree_parentfd(try), try->name, mode);
return (toys.optflags & FLAG_R) ? DIRTREE_RECURSE : 0;
void chmod_main(void)
TT.mode = *toys.optargs;
char **file;
for (file = toys.optargs+1; *file; file++) dirtree_read(*file, do_chmod);