loops in shell

for((i=1;i<=10;i++));

do

echo $i

done

echo "end of 1st loop"

for i in {20..30}

do

echo $i

done

echo "end of 2nd loop"

i=40

while [ $i -le 50 ]

do

echo $i

let i=i+1

done

echo "end of 3rd loop"

============================================
seq 1 100

====================================

# print 1 to 100
for i in `seq 1 100`; do echo $i; done

==========================
# display 1 to 10 numbers using while loop
# vi while.sh
# !.bin/sh
a=1
while [[ $a -le 10 ]]
do
echo “$a”
a= ` expr a + 1 ` or let a=a+1
done

===============================================

HowTo: Unix For Loop 1 to 100 Numbers

Posted onJanuary 16, 2010in CategoriesBASH Shell, KSH Shell, UNIX last updated July 16, 2011

Iwant to run a Unix command 100 times using a for loop from 1 to 100. Can you tell me how to take a block of numbers in a loop under KSH or BASH shell?

You can use the following syntax to run a for loop.

Ksh For Loop 1 to 100 Numbers

#!/bin/ksh # Tested with ksh version JM 93t+ 2010-03-05 for i in {1..100} do # your-unix-command-here echo $i done

Bash For Loop 1 to 100 Numbers

#!/bin/bash # Tested using bash version 4.1.5 for ((i=1;i<=100;i++)); do # your-unix-command-here echo $i done

Dealing With Older KSH88 or Bash shell

The above KSH and Bash syntax will not work on older ksh version running on HP-UX or AIX. Use the following portable syntax:

#!/usr/bin/ksh c=1 while [[ $c -le 100 ]] do # your-unix-command-here echo "$c" let c=c+1 done

https://www.cyberciti.biz/faq/unix-for-loop-1-to-10/