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# 1  
Old 03-16-2011
sed counting lines
Hi,

I'm using the command: sed -n '$=' $1 on a sh script on AIX.

This script is used to count the number of lines of files.
If the file has no lines at all the command doesn't return nothing.
I need the command to return 0 when the file has no lines at all.
How can I achieve this?

Best Regards,
jppedroso
# 2  
Old 03-16-2011
You could do [ -z "$VAR" ] && VAR=0 to force the var to be zero when it's empty. Or just use it like "${VAR-0}" which will assume its value to be zero when it's empty in nearly any bourne or ksh shell. Does your wc support -l? You could replace sed filename with wc -l < filename
This User Gave Thanks to Corona688 For This Post:
jppedroso
# 3  
Old 03-16-2011
Code:
[ -s $1 ]  &&  sed -n '$=' $1  || echo '0'

This User Gave Thanks to jim mcnamara For This Post:
jppedroso
# 4  
Old 03-16-2011
Corona688, we donīt use wc -l as in AIX gives different results than in HP... thanks anyway!

jim mcnamara, I will try this, thanks!
# 5  
Old 03-16-2011
By awk.
Code:
awk 'END{print NR}' $1

You will get 0, if the file is empty.
This User Gave Thanks to rdcwayx For This Post:
jppedroso
# 6  
Old 03-17-2011
Thks to all. jim mcnamara solution solved my problem.
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