> > setenv/unsetenv are commands that are built into the csh family > of shells. Under bash the equivalent built ins are export and > unset. For example: > > CSH: setenv name value > BASH: export name=value > > CSH: unsetenv name > BASH: unset name > > <soapbox> > yes, ...
$ env | grep TEST #此命令有输出,证明环境变量TEST已经存在了 TEST=test $ unset $TEST #删除环境变量TEST $ env | grep TEST #此命令无输出,证明环境变量TEST已经存在了 1. 2. 3. 4. 5. 6. 3.6 使用readonly命令设置只读变量 如果使用了readonly命令的话,变量就不可以被修改或清除了。示例如下: $ ...
command --sandbox-path PATH Make PATH the sandbox path instead of empty [default: empty] --execdir @LOCATION[/DIR] Specify the execution directory of each specfile | [default: @project] -e, --env NAME[=VALUE] Set environment variable --env-from ENV-SCRIPT Set environment variable from ...
BASH_FUNC_VSNPRINTF dnl If putenv or unsetenv is not present, set the right define so the dnl prototype and declaration in lib/sh/getenv.c will be standard-conformant if test "$ac_cv_func_putenv" = "yes"; then BASH_FUNC_STD_PUTENV else AC_DEFINE(HAVE_STD_PUTENV) fi ...