Using the for statement

Another way to loop is to use the for statement. It is commonly used when working with files and other lists. The general syntax of a for loop is as follows:

 for variable in list
 do
     some commands
 done

The list can be a collection of strings, or a filename wildcard, and so on. We can take a look at this in the example given in the next section.

Chapter 3 - Script 7

#!/bin/sh
#
# 5/4/2017
#
echo "script7 - Linux Scripting Book"

for i in jkl.c bob Linux "Hello there" 1 2 3
do
 echo -n "$i "
done

for i in script*             # returns the scripts in this directory
do
 echo $i
done

echo "End of script7"
exit 0

And the output on my system. This is my chap3 directory:

The next script shows how the for statement can be used with files:

Chapter 3 - Script 8

#!/bin/sh
#
# 5/3/2017
#
echo "script8 - Linux Scripting Book"

if [ $# -eq 0 ] ; then
 echo "Please enter at least 1 parameter."
 exit 255
fi

for i in $*                  # the "$*" returns every parameter given 
do...