I am making a script that works with directories that have suffixes defined and separated by ".", for example "folder.teste.git" or "things.var" and would like to take as a variable only the prefix eliminating the last one part (eg the name "folder.test" or "things").
I tried with the cut and the grep but I could not get it backwards. I was unable to delete the last occurrence after the ".".
You do not need to use any extra tools for this, since bash itself is able to separate these words. Assign the file name to a variable and use the % modifier:
nome_de_arquivo_completo="pasta.teste.git"
nome_de_arquivo_sem_extensao="${nome_de_arquivo_completo%.*}"
echo "${nome_de_arquivo_sem_extensao}"
Or, in a handy example with multiple files in the current directory:
#!/bin/bash
for filename in *; do
echo "${filename%.*}"
done
What happens is that the % modifier removes a specified pattern from the end of a variable immediately afterwards ( .* , in this case).
Normally in these situations it is useful to have prefix and suffix. Already using another different approach:
ls -d *.*/ | ## get directorias contendo "."
sed -r 's!(.*)\.(.*)/!\n!' | ## separar prefixo suf.
while read p && read e ## para cada par (prefixo, suf)
do
echo "Prefixo: $p" "suf: $e" ## processar em função do prefixo, suf
done
Example of processing: sort the directories depending on the suff - replace the "echo" with:
mkdir -p $e
mv "$p.$e" $e/$p