For loop in shell script

for i in {1..5}
do
   echo "Welcome $i times"
done

Loop bash

years=(2018 2019)
days=(74 274)

for year in "${years[@]}"; do
    for day in $(seq -w ${days[0]} ${days[1]}); do
               echo $year
               echo $day
    done
done

For loop in shell script

for i in `seq 1 10`
do
	echo $i #Do something here.
done

Loop bash

Use for in bash for iterating words in a string or values in an array as:
for value in {1, 2, 3}; do echo $value; done
for value in $(cat arguments_files.txt); do [some_command]; done
And use while for iterating lines from a pipe output as:
cat arguments_file.txt | while read line; do [some_command]; done

Bash for loop

for FILE in $(ls -A); do la $FILE; done

For loop iteration in shell script

#!/bin/bash
START=1
END=5
echo "Countdown"
 
for (( c=$START; c<=$END; c++ ))
do
	echo -n "$c "
	sleep 1
done
 
echo
echo "Boom!"

Source: cyberciti.biz

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