DevOps.md

grep grep -r pattern find in files grep -i pattern ignore case grep -o pattern print file:match grep -h pattern hide filename grep -e pattern -e str2 multiples strings grep -v pattern compli¬menting line grep -c pattern print count grep -n pattern print # of matches grep -w pattern match whole pattern

find find path -type f -name file search only filenames find path -type d -name dir search only dir names find path -mtime +7 -ls older than 7 days find path -size -10M -ls less than 10 MB G/K find path -exec grep -i str {} + find in files

du du -a dir all files du -h dir human du -m dir in mb du -c dir sum du -s dir only sum du --max-¬depth=1 dir 1 dir level deep

loops seq 5 | xargs -I{} cmd for i in {1..5}; do date; done for vm in web log db; do uptime; done

tar tar cvf f.tar f1 f2 f3 ... create tar tar xvf f.tar extract tar tar tvf f.tar view tar

sed sed -i'.bak' 's/old¬/new/g' replace after backup sed 's/ab/¬xy/¬g;s¬/de¬/pq/g' multiple replaces sed '10,20 s/abc/¬xyz/g' replace in range awk awk -F',' '{print $1"@¬"$3}' print col1@col3 awk -F'\t' '/str/ {print $0}' print line with str awk -F: '{print $(NF-1)}' print II col from right awk -F'(,|¬:|;)' '{print }' multiple separators awk '$1 == 100 {print}' comparison <, >, <=, >= awk 'END {print NR " & " NF}' print # of rows and cols awk 'BEGIN {action} /pattern/ END {action}'

stdin stdout cmd 1>f.out stdout to f.out cmd 1>f.out stderr to f.out cmd &>¬f.out stdout and stderr to f.out

sort sort -n numeric sort -r reverse

uniq uniq -c print count uniq -d only dups uniq -u only unique uniq -i ignore case ideally uniq should be used after sort

cut cut -d ',' -f 1,3,5 print csv cols 1, 3 and 5 cut -d: -f 1 --comp¬liment print all cols except 1 cut -f -3 print cols 1, 2 and 3 cut -f 3- print cols 3, 4 ...

tr tr old new replace old with new tr -s ' ' replace multiple space with single typical use: cat something | tr old new

curl curl -o file url save to file curi -I url only header curl -k https:¬//url ignore cert curl -u <us¬r:p¬wd> url username password curl -w add timeout

misc 1 top cpu mem info free -m mem status lsof open files netstat nw traffic dig servername dns nslookup servername dns time cmd exe time watch cmd auto exe zip -d f.zip fname delete file from zip umount -l mnt unmount when free mount -a mount all ln -s file link create symlink

misc 2 | xargs cmd throws what pipe gave after cmd ps -ef list processes nc -l 1234 listen on 1234 nc 127.0.0.1 1234 send data to 1234 cp -p old new cp permis¬sions also