bash-loops.md

bash for loop

Run multiple commands in the background

eg: run curl 10 times in background

for i in {1..10};  do curl http://localhost:8080/healthCheck &   done

Loop/run repeatedly

for i in $(seq 1 24); do date +"%H:%M:%S"; ( doStuff & ); sleep 300; done

doStuff runs every 5 mins for 2 hours. doStuff is run in the background so that the sleep happens in parallel, and therefore doStuff is run exactly every 5 minutes regardless of how long it takes to run.

Loop through strings

for element in a b c; do echo $element; done

Loop through files

for file in *.esdocs.*; do echo "$file"; done

Loop through array

array=(one two three)
for i in "${array[@]}"
do
   echo "$i"
done

Array elements can be on their own line.