How to comment out particular lines in a shell script

Question

Can anyone suggest how to comment particular lines in the shell script other than     Suppose I want to comment five lines   Instead of adding   to each line  is there any other way to comment the five lines

User · Answer

for single line comment add       at starting of a line for multiple line comments add      single quote  from where you want to start  amp  add      again single quote  at the point where you want to end the comment line

User · Answer

Yes  although it s a nasty hack   You can use a heredoc thus      bin sh    do valuable stuff here touch  tmp a    now comment out all the stuff below up to the EOF echo  lt  lt EOF             EOF   What s this doing   A heredoc feeds all the following input up to the terminator  in this case  EOF  into the nominated command  So you can surround the code you wish to comment out with  echo  lt  lt EOF     EOF   and it ll take all the code contained between the two EOFs and feed them to echo  echo doesn t read from stdin so it all gets thrown away    Note that with the above you can put anything in the heredoc  It doesn t have to be valid shell code  i e  it doesn t have to parse properly    This is very nasty  and I offer it only as a point of interest  You can t do the equivalent of C s

User · Answer

You can comment section of a script using a conditional   For example  the following script   DEBUG false if   DEBUG   then echo 1 echo 2 echo 3 echo 4 echo 5 fi echo 6 echo 7   would output   6 7   In order to uncomment the section of the code  you simply need to comment the variable    DEBUG false    Doing so would print the numbers 1 through 7

User · Answer

You have to rely on     but to make the task easier in vi you can perform the following  press escape first     10 20 s       with 10 and 20 being the start and end line numbers of the lines you want to comment out  and to undo when you are complete    10 20 s

[shell] How to comment out particular lines in a shell script

Examples related to shell

Examples related to unix

Examples related to sh