Q. How do I use bash for loop under Linux operating systems?
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A. for loop is used to process group of files or for other automation purposes.
Linux bash for loop syntax
for variable in list
do
echo $variable
done |
for variable in list
do
echo $variable
done
To loop through all files in a directory, enter:
for file in *
do
echo $file
done |
for file in *
do
echo $file
done
To print number 1 to 10, enter:
for n in {1..10}
do
echo $n
done |
for n in {1..10}
do
echo $n
done
Shell script to print odd and even number using a for loop
#!/bin/bash
for n in {1..10}
do
out=$(( $n % 2 ))
if [ $out -eq 0 ]
then
echo "$n is even number"
else
echo "$n is ODD number"
fi
done |
#!/bin/bash
for n in {1..10}
do
out=$(( $n % 2 ))
if [ $out -eq 0 ]
then
echo "$n is even number"
else
echo "$n is ODD number"
fi
done
See more bash for loop examples here.
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.
1 comment
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