View source for Bash loops

[[Category:Linux]]

Executing a Do loop to repeat one command with different hosts
 # for num in {1..5}; do ssh host-$num "shutdown"; done
 # for host in `cat hosts.txt`; do ssh $host "shutdown"; done
 # while read LINE; do COMMAND $LINE; done < FILE

Executing something based on command's output
 # for x in $(cmd1) ; do cmd2 $x ; done
 # while read x ; do cmd2 $x ; done << (cmd1)
 # while read x ; do cmd $x ; done < file.txt

Executing the same command forever
 # while true; do date +%s; done