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DQNEO/fork_pwd.sh

Created December 24, 2015 14:25
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$(pwd) vs $PWD comparison
Raw
fork_pwd.sh
#!/bin/bash
for i in $(seq 1 10000)
do
echo $(pwd) >/dev/null
done
Raw
var_pwd.sh
#!/bin/bash
for i in $(seq 1 10000)
do
echo $PWD >/dev/null
done
@DQNEO
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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
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miy4mori commented Jun 4, 2017

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

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