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)