CODEWITHSUNDEEP
shellunixexpect
ScrappyDev
ScrappyDev

Reputation: 2778

How to validate number of input parameters in an expect shell script?

I'm trying to validate the number of arguments in a shell script I'm creating.
The script will be using expect.

Error

invalid command name "$#"
    while executing
"$# -ne 3 "
    invoked from within
"if [ $# -ne 3 ] then"

Script:

#!/usr/bin/expect -f
if [ $# -ne 3 ] then
   echo "Wrong number of arguments provided"
   echo "fgrep_host.sh hostname filter_text new_file"
   exit
fi

Upvotes: 0

Views: 1218

Answers (1)

e.dan
e.dan

Reputation: 7507

As @Dinesh said, an expect script is not a shell script, it's an expect script, which is Tcl.

To do what you want, you'd write it:

#!/usr/bin/expect -f
if {$argc != 3} {
  puts "Wrong number of arguments provided"
  puts "fgrep_host.sh hostname filter_text new_file"
  exit 1
}

(though you shouldn't be adding the .sh extension)

You're going to have to read up on expect and Tcl to continue.

Upvotes: 3

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