shell script (KSH) + set file to param & perform test between param and string

Question

in my linux machine red-hat 5.1 - in ppp file - I have only the signature.pl string !!!

• remark - third application write the signature.pl string in to ppp file

I set ppp file in $a param And compare $a with signature.pl

But as all see here this not equal - why ? or if I have empty space? How to solve this?

    [root@cm /var/tmp]# more /var/tmp/ppp
    signature.pl
    [root@cm /var/tmp]# a=` cat  /var/tmp/ppp `
    [root@cm /var/tmp]# echo $a
    signature.pl
    [root@cm /var/tmp]# [[ $a = signature.pl ]] && echo equel   (not print equel)

or

    [root@cm /var/tmp]# [[ $a == signature.pl ]] && echo equel   (not print equel)

diff example that works ! - from ksh shell (LINUX RED-HAT 5.1)

[u@h w]# echo signature.sh > file
[u@h w]# cat file
signature.sh
[u@h w]# a=`cat file`  
[u@h w]# echo $a
signature.sh
[u@h w]# [[ $a = signature.sh ]] && echo eq

 its print "eq"

Answer 1

You need two equal signs:

[[ $a == signature.pl ]] && echo equal