I want 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.
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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 |
#!/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 |
#!/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 |
#!/usr/bin/ksh
c=1
while [[ $c -le 100 ]]
do
# your-unix-command-here
echo "$c"
let c=c+1
done
Posted by: Vivek Gite
The author is the creator of nixCraft and a seasoned sysadmin, DevOps engineer, and a trainer for the Linux operating system/Unix shell scripting. Get the latest tutorials on SysAdmin, Linux/Unix and open source topics via RSS/XML feed or weekly email newsletter.
5 comment
This script worked for me in AIX
#!/bin/bash for i in {1..10} do echo $i doneThe Ksh example works in bash (on Ubuntu 14.10)
# 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
# now it display 1 to 1o numbers
seq 1 100
# print 1 to 100
for i in `seq 1 100`; do echo $i; done