1/* env.c - Set the environment for command invocation. 2 * 3 * Copyright 2012 Tryn Mirell <tryn@mirell.org> 4 * 5 * http://opengroup.org/onlinepubs/9699919799/utilities/env.html 6 * 7 * Deviations from posix: "-" argument and -0 8 9USE_ENV(NEWTOY(env, "^0iu*", TOYFLAG_USR|TOYFLAG_BIN|TOYFLAG_ARGFAIL(125))) 10 11config ENV 12 bool "env" 13 default y 14 help 15 usage: env [-i] [-u NAME] [NAME=VALUE...] [COMMAND [ARG...]] 16 17 Set the environment for command invocation, or list environment variables. 18 19 -i Clear existing environment 20 -u NAME Remove NAME from the environment 21 -0 Use null instead of newline in output 22*/ 23 24#define FOR_env 25#include "toys.h" 26 27GLOBALS( 28 struct arg_list *u; 29); 30 31void env_main(void) 32{ 33 char **ev = toys.optargs; 34 struct arg_list *u; 35 36 // If first nonoption argument is "-" treat it as -i 37 if (*ev && **ev == '-' && !(*ev)[1]) { 38 toys.optflags |= FLAG_i; 39 ev++; 40 } 41 42 if (FLAG(i)) xclearenv(); 43 else for (u = TT.u; u; u = u->next) xunsetenv(u->arg); 44 45 for (; *ev; ev++) 46 if (strchr(*ev, '=')) xsetenv(xstrdup(*ev), 0); 47 else { 48 // a common use of env is to bypass shell builtins 49 toys.stacktop = 0; 50 xexec(ev); 51 } 52 53 for (ev = environ; *ev; ev++) xprintf("%s%c", *ev, '\n'*!FLAG(0)); 54} 55