The for loop in Linux
Updated September 12, 2002
Created November 19, 2001

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for X in 1 2 3; do echo $X; done
for X in /tmp/*; do echo ls -l /tmp/$X; done
for X in 1 2 3; do echo num${X}oftotal; done

     for X in 1 2 3; do
          echo $X
     done

Command Line mode:

#Listing all the parameters 
for X in 1 2 3; do echo $X; done
Output: 
1
2
3
#Using filenames as parameters 
for X in /tmp/*; do echo ls -l /tmp/$X; done
#When characters immediately follow the variable name, #you may should use curly braces to separate the variable from the text: 
for X in 1 2 3; do echo num${X}oftotal; done
Output: 
   num1oftotal
   num2oftotal
   num3oftotal

Script Mode:

for X in 1 2 3; do
     echo $X
done
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