DQNEO/fork_pwd.sh

Created December 24, 2015 14:25

Star (1) You must be signed in to star a gist
Fork (0) You must be signed in to fork a gist

Learn more about clone URLs
Clone this repository at <script src="https://gist.github.com/DQNEO/c7c68f8f6e06eb4cfa9e.js"></script>
Save DQNEO/c7c68f8f6e06eb4cfa9e to your computer and use it in GitHub Desktop.

Download ZIP

$(pwd) vs $PWD comparison

Raw

fork_pwd.sh

	#!/bin/bash

	for i in $(seq 1 10000)
	do
	echo $(pwd) >/dev/null
	done

Raw

	#!/bin/bash

	for i in $(seq 1 10000)
	do
	echo $PWD >/dev/null
	done

Author

DQNEO commented Dec 24, 2015

Benchmark results

$ time fork_pwd.sh
fork_pwd.sh  3.42s user 5.83s system 92% cpu 9.961 total

$ time var_pwd.sh
var_pwd.sh  0.15s user 0.07s system 98% cpu 0.222 total

miy4mori commented Jun 4, 2017

$PWD is a variable,$(pwd) will execute the command pwd.

Sign up for free to join this conversation on GitHub. Already have an account? Sign in to comment