exec
exec
Runs an executable
Description
With Murex, like most other shells, you launch a process by calling the name of that executable directly. While this is suitable 99% of the time, occasionally you might run into an edge case where that wouldn't work. The primary reason being if you needed to launch a process from a variable, eg
» set exe=uname
» $exe
uname
As you can see here, Murex's behavior here is to output the contents of the variable rather then executing the contents of the variable. This is done for safety reasons, however if you wanted to override that behavior then you could prefix the variable with exec:
» set exe=uname
» exec $exe
Linux
Usage
<stdin> -> exec
<stdin> -> exec -> <stdout>
exec -> <stdout>
Examples
» exec printf "Hello, world!"
Hello, world!
Working around aliases:
If you have an alias like alias ls=ls --color=auto
and you wanted to run ls
but without colour, you might run exec ls
.
Detail
If any command doesn't exist as a builtin, function nor alias, then Murex will default to forking out to any command with this name (subject to an absolute path or the order of precedence in $PATH
). Any forked process will show up in both the operating systems process viewer (eg ps
) but also Murex's own process viewer, fid-list
. However inside fid-list
you will notice that all external processes are listed as exec
with the process name as part of exec
's parameters. That is because exec
is handler for programs that aren't native to Murex.
Compatibility with POSIX
For compatibility with traditional shells like Bash and Zsh, command
is an alias for exec
.
Synonyms
exec
command
See Also
bexists
: Check which builtins existbg
: Run processes in the backgroundbuiltins
: Returns runtime information on the internal state of Murexfexec
: Execute a command or function, bypassing the usual order of precedence.fg
: Sends a background process into the foregroundfid-kill
: Terminate a running Murex functionfid-killall
: Terminate all running Murex functionsfid-list
: Lists all running functions within the current Murex sessionjobs
: Lists all running functions within the current Murex sessionmurex-update-exe-list
: Forces Murex to rescan $PATH looking for executablesset
: Define a local variable and set it's value