For Loop to Execute Commands

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This is a multipart blog article series where I am going to explain the concepts of shell scripting and how to write a shell script in Linux, UNIX or Mac based systems. You can also follow this tutorial blog using windows but for that you have to install a bash from.

In this article we are going to see that how we can use bash commands in shell script with the help of for loop.

  • We can use for loop to execute commands, like this.
    for <variable_name> in ls pwd date
    do
      echo "----------$<variable_name>----------"
      $<variable_name>
    done
    
  • In this example first ls command will get executed then pwd command and in last date command.
  • Let’s solve another problem we have to print the name of all directories present in any folder using for loop.
    for <variable_name> in *
    do
      if [ -d $<variable_name> ]
      then 
          echo $<variable_name>
      fi
    done
    
  • Here * will go through each file and every file present in that directory.
  • If condition will check that whether that file is a directory or not, if it is a directory than its name get printed.

Reference code file for this article

So this was all about how can we execute some commands using for loop in shell script. Hope you liked it and learned something new form it.

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