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solved - removing last n char in every line

 
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Top Forums UNIX for Dummies Questions & Answers solved - removing last n char in every line
# 1  
Old 07-29-2010
solved - removing last n char in every line
Hi all,
I want to remove last n char in every line. I'm having the comment as,

[COLOR=black][FONT=Verdana]
Code:
cnt=10
cat filename | rev | cut -c $cnt- | rev


I want to have it with sed or awk or any command except perl. Pls help me in the comment. I have tried few options using sed. But not able to get it.

Thanks,
Poova.
Last edited by Yogesh Sawant; 08-04-2010 at 09:05 AM.. Reason: code tags, please!
# 2  
Old 07-29-2010
Code:
sed 's/.$//' filename

# 3  
Old 07-29-2010
Code:
string="abcde"
len=${#string}
cnt=2
echo ${string:0:$((len-cnt))}

# 4  
Old 07-30-2010
Thanks,
Do we have it in sed without identifying length and using it in echo?

---------- Post updated at 09:39 AM ---------- Previous update was at 09:36 AM ----------
Quote:
Originally Posted by vgersh99
Code:
sed 's/.$//' filename

If i want to pass no.char to be removed from last in a variable then How can we write the command?
# 5  
Old 07-30-2010
Like this ?

Code:
# cat infile
testt
test1
test11
testz
testX

Code:
 
# sed 's/[^0-9]$//' infile
test
test1
test11
test
test

# 6  
Old 08-03-2010
using Perl:
Code:
perl -nl -e 'print substr($_, 0, (length($_) - 3))' file.txt

edit: replace 3 with number of characters that you want to omit from the end of line
# 7  
Old 08-03-2010
You can pass a variable to sed as shown here:
Code:
# cat infile
testt
test1
test11
testz
testX

Code:
$ CNT=3
$ echo $CNT
3
$ sed "s/.\{${CNT}\}$//" infile
te
te
tes
te
te
$

 
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