Trying to run a basic for loop Post: 302863909

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Top Forums Shell Programming and Scripting Trying to run a basic for loop Post 302863909 by kraljic on Tuesday 15th of October 2013 12:05:24 PM

10-15-2013

Registered User

Trying to run a basic for loop

OS : RHEL 6.1
Shell : Bash

I had a similair post on this a few weeks back. But I didn't explain my requirements clearly then. Hence starting a new thread now.

I have lots of files in /tmp/stage directory as show below.

I want to loop through each files to run a command on each file.
I want to skip those files whose names end with a number. How can I do this ? My following attempts in writing the for loop has failed.

Code:

# touch sharp
# touch sharper
# touch sharpest
# touch sharpener
# touch sharpy
# touch sharper2
# touch sharpest4

# pwd
/tmp/stage
# ls -ld *
-rw-r--r--. 1 root root 0 Oct  8 03:12 sharp
-rw-r--r--. 1 root root 0 Oct  8 03:12 sharpener
-rw-r--r--. 1 root root 0 Oct  8 03:12 sharper
-rw-r--r--. 1 root root 0 Oct  8 03:14 sharper2
-rw-r--r--. 1 root root 0 Oct  8 03:12 sharpest
-rw-r--r--. 1 root root 0 Oct  8 03:14 sharpest4
-rw-r--r--. 1 root root 0 Oct  8 03:12 sharpy
#

# for i in /tmp/stage/sharp[a-b]* ; do echo $i ; done
/tmp/stage/sharp[a-b]*
#
#
#
# for i in /tmp/stage/sharp[a-b] ; do echo $i ; done
/tmp/stage/sharp[a-b]
#
#
# for i in /tmp/stage/sharp*[a-b] ; do echo $i ; done
/tmp/stage/sharp*[a-b]
#

I want this for loop to run a command on each file like

Code:

for f in /tmp/stage/sharp[a-z]
do
 echo "Processing $f"
 # do something on $f
done

kraljic

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chroot

chroot(1M)						  System Administration Commands						chroot(1M)

NAME

       chroot - change root directory for a command

SYNOPSIS

       /usr/sbin/chroot newroot command

DESCRIPTION

       The  chroot  utility causes command to be executed relative to newroot. The meaning of any initial slashes (/) in the path names is changed
       to newroot for command and any of its child processes. Upon execution, the initial working directory is newroot.

       Notice that redirecting the output of command to a file,

	 chroot newroot command >x

       will create the file x relative to the original root of command, not the new one.

       The new root path name is always relative to the current root. Even if a chroot is currently in effect, the newroot argument is relative to
       the current root of the running process.

       This command can be run only by the super-user.

RETURN VALUES

       The exit status of chroot is the return value of command.

EXAMPLES

       Example 1 Using the chroot Utility

       The  chroot  utility  provides an easy way to extract tar files (see tar(1)) written with absolute filenames to a different location. It is
       necessary to copy the shared libraries used by tar (see ldd(1)) to the newroot filesystem.

	 example# mkdir /tmp/lib; cd /lib
	 example# cp ld.so.1 libc.so.1 libcmd.so.1 libdl.so.1 
		  libsec.so.1 /tmp/lib
	 example# cp /usr/bin/tar /tmp
	 example# dd if=/dev/rmt/0 | chroot /tmp tar xvf -

ATTRIBUTES

       See attributes(5) for descriptions of the following attributes:

       +-----------------------------+-----------------------------+
       |      ATTRIBUTE TYPE	     |	    ATTRIBUTE VALUE	   |
       +-----------------------------+-----------------------------+
       |Availability		     |SUNWcsu			   |
       +-----------------------------+-----------------------------+

SEE ALSO

       cd(1), tar(1), chroot(2), ttyname(3C), attributes(5)

NOTES

       Exercise extreme caution when referencing device files in the new root file system.

       References by routines such as ttyname(3C) to stdin, stdout, and stderr will find that the device associated with the  file  descriptor	is
       unknown after chroot is run.

SunOS 5.11							    15 Dec 2003 							chroot(1M)