Contact US

Log In

Come Join Us!

Are you a
Computer / IT professional?
Join Tek-Tips Forums!
  • Talk With Other Members
  • Be Notified Of Responses
    To Your Posts
  • Keyword Search
  • One-Click Access To Your
    Favorite Forums
  • Automated Signatures
    On Your Posts
  • Best Of All, It's Free!

*Tek-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail.

Posting Guidelines

Promoting, selling, recruiting, coursework and thesis posting is forbidden.

Students Click Here

file availability getline way

file availability getline way

file availability getline way


I am using getline to check whether input file is available or not.

The following is working fine:

Input file name: file<ym>

read -p "Enter month : " ym
awk 'BEGIN{
print getline < "file'$ym'" <0 ? "Not Available" : "Available"

but when i use the variable within awk its not working

awk 'BEGIN{
print getline < "file"month <0 ? "Not Available" : "Available"

Please help
Thank you

RE: file availability getline way


Dumb thing as according to operator precedence should be fine, but in reality you have to add parentheses :


awk 'BEGIN{
print getline < ("file"month) <0 ? "Not Available" : "Available"


RE: file availability getline way

Thank you very much!
Does this parenthesis syntax apply only when getline is used?

RE: file availability getline way


Maybe my memories are failing, as I can not reproduce it right now, but I have a feeling that also met it with print when writing to file. But I would say on file/pipe input/output operations.


Red Flag This Post

Please let us know here why this post is inappropriate. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework.

Red Flag Submitted

Thank you for helping keep Tek-Tips Forums free from inappropriate posts.
The Tek-Tips staff will check this out and take appropriate action.

Reply To This Thread

Posting in the Tek-Tips forums is a member-only feature.

Click Here to join Tek-Tips and talk with other members! Already a Member? Login

Close Box

Join Tek-Tips® Today!

Join your peers on the Internet's largest technical computer professional community.
It's easy to join and it's free.

Here's Why Members Love Tek-Tips Forums:

Register now while it's still free!

Already a member? Close this window and log in.

Join Us             Close