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Shell Programming and Scripting

Multiple conditions in IF

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Top Forums Shell Programming and Scripting Multiple conditions in IF
# 8  
Old 06-07-2016
Quote:
Originally Posted by xeccc5z
...am passing the file names as command line argument...
Why not use bash's special parameter #?
# Expands to the number of positional parameters in decimal.
Example:
Code:
#!/bin/bash

if [[ "$#" -ne "3" ]]; then
 echo "Need 3 files, you supplied $#, please try again."
 exit 1
fi

set -x
file1=$1
file2=$2
file3=$3
set +x

Test:
Code:
$ ./script
Need 3 files, you supplied 0, please try again.
$ ./script foo
Need 3 files, you supplied 1, please try again.
$ ./script foo bar
Need 3 files, you supplied 2, please try again.
$ ./script foo bar baz
+ file1=foo
+ file2=bar
+ file3=baz
+ set +x
$
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