Exec: Difference between revisions
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exec [-cl] [-a name] [command [arguments]] | |||
If command is specified, it replaces the shell. No new process is created. The arguments become the arguments to command. | |||
If the -l option is supplied, the shell places a dash at the beginning of the zeroth argument passed to command (this is what login does). The -c option causes command to be executed with an empty environment. If -a is supplied, the shell passes name as the zeroth argument to the executed command. If command cannot be executed for some reason, a non-interactive shell exits, unless the shell option execfail is enabled, in which case it returns failure. An interactive shell returns failure if the file cannot be executed. If command is not specified, any redirections take effect in the current shell, and the return status is 0. If there is a redirection error, the return status is 1. | |||
Latest revision as of 21:21, 15 February 2018
Internal
Overview
exec [-cl] [-a name] [command [arguments]]
If command is specified, it replaces the shell. No new process is created. The arguments become the arguments to command.
If the -l option is supplied, the shell places a dash at the beginning of the zeroth argument passed to command (this is what login does). The -c option causes command to be executed with an empty environment. If -a is supplied, the shell passes name as the zeroth argument to the executed command. If command cannot be executed for some reason, a non-interactive shell exits, unless the shell option execfail is enabled, in which case it returns failure. An interactive shell returns failure if the file cannot be executed. If command is not specified, any redirections take effect in the current shell, and the return status is 0. If there is a redirection error, the return status is 1.