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Shell Programming and Scripting

How to remove the last 3 lines from many files?

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Top Forums Shell Programming and Scripting How to remove the last 3 lines from many files?
# 8  
Old 06-27-2012
Quote:
Originally Posted by MaRiOsGR
radoulov thank you for the reply.
The js files are in random folders for example vhost/folder1/test.js
or vhost/folder213/my.js
etc etc
Code:
find /vhost -type f -name '*.js' -exec bash -c '
  f=$1
  tac "$f" | 
    tail -n +4 |
      tac > "$f"_tmp_ && 
        mv -- "$f"_tmp_ "$f" 
  ' - {} \;

# 9  
Old 06-27-2012
balajesuri The js files are in random folders for example vhost/folder1/test.js
or vhost/folder213/my.js
etc etc
so
/var/ww/vhost/*.js wont work
# 10  
Old 06-27-2012
in bash

take backup first as itkamaraj said



Code:
find /var/ww/vhost -name "*.js" | while read i ; do lines=$(cat ${i} | wc -l ) ; sed -i "$((${lines} - 2 )),${lines}d" $i  ; done

# 11  
Old 06-27-2012
@MaRiOsGR: I've edited my post. Please check again. (Before I could post a solution, lot many members posted and you had already asked for recursive searching of js files. I read your requirement after posting my solution)
# 12  
Old 06-27-2012
This one worked just perfect.
Is there any way to remove the lines only if the js file includes the text "km0ae9gr6m" ?

Quote:
Originally Posted by radoulov
Code:
find /vhost -type f -name '*.js' -exec bash -c '
  f=$1
  tac "$f" | 
    tail -n +4 |
      tac > "$f"_tmp_ && 
        mv -- "$f"_tmp_ "$f" 
  ' - {} \;

# 13  
Old 06-27-2012
Yes:

Code:
find /vhost -type f -name '*.js' -exec bash -c '
  f=$1
  grep -q km0ae9gr6m "$f" &&
    tac "$f" | 
      tail -n +4 |
        tac > "$f"_tmp_ && 
          mv -- "$f"_tmp_ "$f" 
  ' - {} \;

# 14  
Old 06-27-2012
This worked great.
And thank you.

but I've found a "bug" (i'm the fault),
I've found that in a 5% percent of the .js files the code I want to remove/erase
was not added in the last 3 lines but in the same line as the rest of the normal javascript code.
the exact hack code starts with
Code:
/*km0ae9gr6m*/

is it possible to remove everything after this code in all files that contain it ?

Quote:
Originally Posted by radoulov
Yes:

Code:
find /vhost -type f -name '*.js' -exec bash -c '
  f=$1
  grep -q km0ae9gr6m "$f" &&
    tac "$f" | 
      tail -n +4 |
        tac > "$f"_tmp_ && 
          mv -- "$f"_tmp_ "$f" 
  ' - {} \;
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