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Add text to file at a certain line

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# 1  
Old 04-20-2005
Add text to file at a certain line
I am trying to add a line of text just before the last line in a file.

For example, if the last line of a file is "exit 0", I need to add a line of text just before that.

Any ideas how I might do that?

Thanks
# 2  
Old 04-20-2005
assuming that you're only interested in scripts with "exit 0" lines and that each script has the exit line as the last line ...
Code:
if [ -x ${file} ]
then
     linecnt=$(awk 'END {print NR - 1}' ${file})
     sed -n "1,${linecnt}p" ${file} > /tmp/$$
     echo "your new text" >> /tmp/$$
     echo "exit 0" >> /tmp/$$
     cat /tmp/$$ > ${file}
     rm /tmp/$$
fi

you can also put in checks to make sure the last line is actually "exit 0" and not a blank new line to make sure you're putting in the required text in the right place ...
Last edited by Just Ice; 04-20-2005 at 07:01 PM.. Reason: correction
# 3  
Old 04-20-2005
Code:
sed -e '$ d' myfile >x
echo "your text" >>x
sed -n '$ p' myfile >>x

mv x myfile

# 4  
Old 04-20-2005
Before...
Code:
line 1
line 2
line 3
line 4

If it's always the second last line that needs inserting, then...
Code:
printf '$i\nSecond-to-last-line!\n.\nwq\n' | ex - somefile

After...
Code:
line 1
line 2
line 3
Second-to-last-line!
line 4

Cheers
ZB
# 5  
Old 04-20-2005
Quote:
Originally Posted by bhargav
Code:
sed -e '$ d' myfile >x
echo "your text" >>x
sed -n '$ p' myfile >>x

mv x myfile

... you would need to do a "chmod a+x" after the "mv" to keep the executable bit on the file ... as well as a "chown" if you're not the original owner of the file ... doing the "cat" line instead fixes these issues ...
Code:
root_icebox:/tmp # cp -p /root/nist.time .
root_icebox:/tmp # ls -l nist.time
-rwxr-xr-x   1 root     other        344 Apr  4 00:53 nist.time
root_icebox:/tmp # chown bin:bin nist.time
root_icebox:/tmp # ls -l nist.time
-rwxr-xr-x   1 bin      bin          344 Apr  4 00:53 nist.time
root_icebox:/tmp # echo "#! /bin/ksh\nhostname\ndate\nexit 0" > mytest
root_icebox:/tmp # ls -l mytest
-rw-r--r--   1 root     other         33 Apr 20 20:41 mytest
root_icebox:/tmp # mv mytest nist.time
root_icebox:/tmp # ls -l nist.time mytest
mytest: No such file or directory
-rw-r--r--   1 root     other         33 Apr 20 20:41 nist.time
root_icebox:/tmp # cp -p /root/nist.time .                            
root_icebox:/tmp # ls -l nist.time                                    
-rwxr-xr-x   1 root     other        344 Apr  4 00:53 nist.time
root_icebox:/tmp # echo "#! /bin/ksh\nhostname\ndate\nexit 0" > mytest
root_icebox:/tmp # ls -l mytest                                       
-rw-r--r--   1 root     other         33 Apr 20 20:47 mytest
root_icebox:/tmp # chown bin:bin nist.time                            
root_icebox:/tmp # ls -l nist.time
-rwxr-xr-x   1 bin      bin          344 Apr  4 00:53 nist.time
root_icebox:/tmp # cat mytest > nist.time                             
root_icebox:/tmp # ls -l nist.time mytest
-rw-r--r--   1 root     other         33 Apr 20 20:47 mytest
-rwxr-xr-x   1 bin      bin           33 Apr 20 20:48 nist.time
root_icebox:/tmp #

# 6  
Old 04-20-2005
Code:
cp file file.old
sed '$iYour text goes here' file.old > file

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