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Top Forums UNIX for Dummies Questions & Answers How to insert text in the middle of a file Post 302193679 by fpmurphy on Saturday 10th of May 2008 02:35:59 PM
Old 05-10-2008
Here is another way of doing it using ed(1)
Code:
#!/bin/ksh93

TMP=file.$$

read TEXT?"Enter a line of text: "

read path?"Enter the file path to append to: "

MIDDLE=$(( $(/bin/wc -l < $path)/2 ))

# build editing command file
cat <<EOT >$TMP
${MIDDLE}
a
${TEXT}
.
w
q
EOT

cat $TMP

# go do the work
/bin/ed -s $path < $TMP

rm $TMP

cat $path

exit 0

 

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BZEXE(1)						      General Commands Manual							  BZEXE(1)

NAME
bzexe - compress executable files in place SYNOPSIS
bzexe [ name ... ] DESCRIPTION
The bzexe 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 ``bzexe /bin/cat'' it will create the following two files: -r-xr-xr-x 1 root bin 9644 Feb 11 11:16 /bin/cat -r-xr-xr-x 1 bin bin 24576 Nov 23 13:21 /bin/cat~ /bin/cat~ is the original file and /bin/cat is the self-uncompressing executable file. You can remove /bin/cat~ once you are sure that /bin/cat 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
bzip2(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 other utilities (tail, chmod, ln, sleep). BUGS
bzexe 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. BZEXE(1)
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