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Top Forums Shell Programming and Scripting How to delete first 5 lines and last five lines in all text files Post 302157441 by summer_cherry on Friday 11th of January 2008 01:38:57 AM
Old 01-11-2008
shell

Hi,

This one is used to delete certain number of line from the head and end of file in a given direcotory.

Hope it is useful for you.

Quote:
echo "please input how many lines you want cut from the head and end"
read line
echo "input the direcoty"
read dir
cd $dir
for i in *
do
n=`cat $i | wc -l`
m=`expr $n - $line`
rel=`expr $m + 1`
sed -e "1d" -e "$rel,\$d" $i > $i.bak

done
 

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line(1) 						      General Commands Manual							   line(1)

NAME
line - Reads one line from standard input SYNOPSIS
line STANDARDS
Interfaces documented on this reference page conform to industry standards as follows: line: XCU5.0 Refer to the standards(5) reference page for more information about industry standards and associated tags. OPTIONS
None DESCRIPTION
The line command copies one line, up to and including a newline, from standard input and writes it to standard output. Use this command within a shell command file to read from your terminal. The line command always writes at least a newline character. NOTES
The line utility has no internationalization features and is marked LEGACY in XCU Issue 5. Use the read utility instead. EXIT STATUS
Success. End-of-File. EXAMPLES
To read a line from the keyboard and append it to a file, enter: echo 'Enter comments for the log:' echo ': c' line >>log This shell procedure displays the message: Enter comments for the log: It then reads a line of text from the keyboard and adds it to the end of the file log. The echo ': c' command displays a : (colon) prompt. See the echo command for information about the c escape sequence. SEE ALSO
Commands: echo(1), ksh(1), read(1), Bourne shell sh(1b), POSIX shell sh(1p) Functions: read(2) Standards: standards(5) line(1)
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