Bash-compare-versions: Difference between revisions
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<metadesc>Bash examples to compare versions</metadesc> | |||
This is a simplistic way to compare version numbers. This is useful for when commands change over time, and you do not know which or what kind of host will have which version of something. | This is a simplistic way to compare version numbers. This is useful for when commands change over time, and you do not know which or what kind of host will have which version of something. | ||
* [https://unix.stackexchange.com/questions/269273/bash-convert-a-string-version-number-to-an-integer|Source page with some examples] | * [https://unix.stackexchange.com/questions/269273/bash-convert-a-string-version-number-to-an-integer|Source page with some examples] | ||
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</pre> | </pre> | ||
Example: | Example: (show the git branch you are on) | ||
<pre> | <pre> | ||
if [[ $(printf '%s\n2.22\n' $(git --version | sed -n '1s/.* //p') | sort -V) != "2.22" ]]; then | if [[ $(printf '%s\n2.22\n' $(git --version | sed -n '1s/.* //p') | sort -V) != "2.22" ]]; then | ||
echo "Earlier version than cutoff" | echo "Earlier version than cutoff" | ||
git rev-parse --abbrev-ref HEAD | |||
else | else | ||
echo "Later version of cutoff" | echo "Later version of cutoff" | ||
git branch --show-current | |||
fi | fi | ||
</pre> | </pre> | ||
If there is a v floating about in your returned string, simply append the following to remove all a-z and A-Z characters. | |||
<pre> | |||
| tr -d [:alpha:] | |||
</pre> | |||
It is important to note that this really IS a string compare and ordering, so watch out for the following: | |||
<pre> | |||
echo -e "2.22\n2.22.0" | sort -V | |||
2.22 | |||
2.22.0 | |||
</pre> | |||
[[Category:bash]] | [[Category:bash]] | ||
Latest revision as of 15:04, 25 April 2024
This is a simplistic way to compare version numbers. This is useful for when commands change over time, and you do not know which or what kind of host will have which version of something.
echo -e "2.22\n11.3.4" | sort -V 2.22 11.3.4
printf '%s\n2.15\n' $(ldd --version | sed -n '1s/.* //p') | sort -V | head -n 1
printf '%s\n2.22\n' $(git --version | sed -n '1s/.* //p') | sort -V
Example: (show the git branch you are on)
if [[ $(printf '%s\n2.22\n' $(git --version | sed -n '1s/.* //p') | sort -V) != "2.22" ]]; then echo "Earlier version than cutoff" git rev-parse --abbrev-ref HEAD else echo "Later version of cutoff" git branch --show-current fi
If there is a v floating about in your returned string, simply append the following to remove all a-z and A-Z characters.
| tr -d [:alpha:]
It is important to note that this really IS a string compare and ordering, so watch out for the following:
echo -e "2.22\n2.22.0" | sort -V 2.22 2.22.0