Add text to file at a certain line Post: 69852

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Top Forums Shell Programming and Scripting Add text to file at a certain line Post 69852 by Just Ice on Wednesday 20th of April 2005 08:52:23 PM

04-20-2005

Registered User

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 #

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LEARN ABOUT MINIX

gzexe

GZEXE(1)                                                      General Commands Manual                                                     GZEXE(1)

NAME

       gzexe - compress executable files in place

SYNOPSIS

       gzexe name ...

DESCRIPTION

       The  gzexe  utility  allows you to compress executables in place and have them automatically uncompress and execute when you run them (at a
       penalty in performance).  For example if you execute ``gzexe /usr/bin/gdb'' it will create the following two files:
           -rwxr-xr-x  1 root root 1026675 Jun  7 13:53 /usr/bin/gdb
           -rwxr-xr-x  1 root root 2304524 May 30 13:02 /usr/bin/gdb~
       /usr/bin/gdb~ is the original file and /usr/bin/gdb is the self-uncompressing executable file.  You can remove /usr/bin/gdb~ once  you  are
       sure that /usr/bin/gdb works properly.

       This utility is most useful on systems with very small disks.

OPTIONS

       -d     Decompress the given executables instead of compressing them.

SEE ALSO

       gzip(1), znew(1), zmore(1), zcmp(1), zforce(1)

CAVEATS

       The  compressed executable is a shell script.  This may create some security holes.  In particular, the compressed executable relies on the
       PATH environment variable to find gzip and some standard utilities (basename, chmod, ln, mkdir, mktemp, rm, sleep, and tail).

BUGS

       gzexe attempts to retain the original file attributes on the compressed executable, but you may have to fix them manually  in  some  cases,
       using chmod or chown.

                                                                                                                                          GZEXE(1)