Here is a useful set of bash features that I had to use today.
From the source linked above:
Given, foo=/tmp/my.dir/filename.tar.gz
We can use bash expressions to tokenize or extract different portions of the variable.
This gives us four combinations for trimming patterns off the beginning or end of a string:
From the source linked above:
Given, foo=/tmp/my.dir/filename.tar.gz
We can use bash expressions to tokenize or extract different portions of the variable.
path = ${foo%/*} (/tmp/my.dir)
file = ${foo##*/} (filename.tar.gz)
base = ${file%%.*} (filename)
ext = ${file#*.} (tar.gz)
This gives us four combinations for trimming patterns off the beginning or end of a string:
- ${variable%pattern}: Trim the shortest match from the end
- ${variable##pattern}: Trim the longest match from the beginning
- ${variable%%pattern}: Trim the longest match from the end
- ${variable#pattern}: Trim the shortest match from the beginning
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