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how to recursively remove all files in directory above certain size
find /opt/TestResults -type f -size +1G | xargs sudo rm -rf -
how to remove a line containing string from a bunch of files
find dir1 dir2 dir3 -type f -iname "*.xml" | xargs grep 'pattern to match'
find dir1 dir2 dir3 -type f -iname "*.xml" | xargs sed -i '/pattern to match/d'
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ho to look per-folder disk usage in linux
sudo du --max-depth=1 --exclude="/home" /usr 2> /dev/null | sort -n -r | head -n20
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how to find a string in log-files and sort the results with bash
grep --include=*.log -rnw . -e "what we want to find" | sort -V | less
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one-liner to remove all old linux kernels for ubuntu
if you experience lack of space in /boot disk, do this:
dpkg -l 'linux-*' | sed '/^ii/!d;/'"$(uname -r | sed "s/\(.*\)-\([^0-9]\+\)/\1/")"'/d;s/^[^ ]* [^ ]* \([^ ]*\).*/\1/;/[0-9]/!d' | xargs sudo apt-get -y purge
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how to run increasing number of parallel tasks in bash script
#!/bin/bash
today=$(date +%Y-%m-%d.%H:%M:%S)
out_file=res_$today.txt
echo 'starting: ' $today > $out_file
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splitting odd rows from even ones with bash one-liner
i=1; while read -r line; do [ $((i++ % 2)) -ne 0 ] && echo $line; done <"combined_source_file" >"even_rows_dest_file" && i=1; while read -r line; do [ $((i++ % 2)) -eq 0 ] && echo $line; done<"combined_source_file" > "odd_rows_dest_file"