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Top Forums Shell Programming and Scripting Mkbootfs writing to stdout in bash script Post 302794717 by Phil3759 on Tuesday 16th of April 2013 01:35:27 PM
Old 04-16-2013
Thanks,
Well, I can do it easily using find . | cpio ...

However, I was a bit confused to not be able to use mkbootfs in a shell script while it works in cmd line

By the way, after further looking, mkbootfs is just a cpio variant, so should not be piped to cpio anyway

So, let's see it as a general question: is there any workaround to such binaries that once in a shell script, write to stdout? And why does the piping fails in this case?
 

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rpm2cpio(1)							   User Commands						       rpm2cpio(1)

NAME
rpm2cpio - convert Red Hat Package (RPM) to cpio archive SYNOPSIS
rpm2cpio [file.rpm] DESCRIPTION
The rpm2cpio utility converts the .rpm file specified as its sole argument to a cpio archive on standard output. (See NOTES.) If no argu- ment is given, an rpm stream is read from standard input. In both cases, rpm2cpio will fail and print a usage message if the standard out- put is a terminal. Therefore, the output is usually redirected to a file or piped through the cpio(1) utility. EXAMPLES
Example 1: Converting an rpm file example% rpm2cpio Device3Dfx-1.1-2.src.rpm | cpio -itv CPIO archive found! -rw-r--r-- 1 root root 2635 Sep 13 16:39 1998, 3dfx.gif -rw-r--r-- 1 root root 11339 Sep 27 16:03 1998, Dev3Dfx.tar.gz -rw-r--r-- 1 root root 1387 Sep 27 16:04 1998, Device3Dfx-1.1-2.spec 31 blocks Example 2: Converting from standard input example% rpm2cpio < Device3Dfx-1.1-2.src.rpm | cpio -itv CPIO archive found! -rw-r--r-- 1 root root 2635 Sep 13 16:39 1998, 3dfx.gif -rw-r--r-- 1 root root 11339 Sep 27 16:03 1998, Dev3Dfx.tar.gz -rw-r--r-- 1 root root 1387 Sep 27 16:04 1998, Device3Dfx-1.1-2.spec 31 blocks ATTRIBUTES
See attributes(5) for descriptions of the following attributes: +-----------------------------+-----------------------------+ | ATTRIBUTE TYPE | ATTRIBUTE VALUE | +-----------------------------+-----------------------------+ |Availability |SUNWrpm | +-----------------------------+-----------------------------+ SEE ALSO
cpio(1), attributes(5) NOTES
rpm2cpio handles versions 3 and 4 RPMs. SunOS 5.10 20 Aug 2001 rpm2cpio(1)
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