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Full Discussion: re-direction
Top Forums Shell Programming and Scripting re-direction Post 302304629 by gsal on Tuesday 7th of April 2009 01:19:34 AM
Old 04-07-2009
re-direction

Say I have a single bin directory with Linux and SunOS executables, like this:

bin/myprog_lnx
bin/myprog_sun

Assume these programs read from stdin and write to stdout and, thus, are meant to be run like this:

myprog_lnx < filein > fileout

My users may log in from a Linux or Solaris client and I don't want to bother them with the suffix...I would like them to simply run the program like this:

myprog < filein > fileout

So, it occurs to me, that I could have a korn shell named "myprog" that when run, it checks for the OS and runs the appropriate executable...

Question: how can the arguments and re-direction typed at the command line after the shell script be passed to the command inside the shell script?

In other words, when I run my shell like this:

> myprog < filein > fileout

in Solaris, the shell should execute
myprog_sun < filein > fileout

when in Linux, the shell should execute
myprog_lnx < filein > fileout




==myprog====
#!/bin/sh

if [[ `uname` = 'SunOS' ]] ; then
suffix='_sun'
elif [[ `uname` = 'Linux' ]] ; then
suffix='_lnx'
fi

myprog${suffix} < filein > fileout <<< how to accomplish this effect???

==myprog====

Thanks in advance for any hints you may offer.

gsal
 

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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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