Query RPM packages for information - Programming One Liner 16

Get information about a RPM

[root@plain home]# rpm -qip gnome-desktop-2.2.2-2.2E.src.rpm
Name : gnome-desktop Relocations: (not relocatable)
Version : 2.2.2 Vendor: Red Hat, Inc.
Release : 2.2E Build Date: Wed 20 Jul 2005 04:12:27 PM CDT
Install Date: (not installed) Build Host: crowe.devel.redhat.com
Group : System Environment/Libraries Source RPM: (none)
Size : 1081813 License: GPL
Signature : DSA/SHA1, Wed 10 Aug 2005 03:04:49 AM CDT, Key ID 219180cddb42a60e
Packager : Red Hat, Inc.
URL : http://www.gnome.org
Summary : Package containing code shared among gnome-panel, gnome-session, nautilus, etc.
Description :
The gnome-desktop package contains an internal library
(libgnomedesktop) used to implement some portions of the GNOME
desktop, and also some data files and other shared components of the
GNOME user environment.

This programming one liner allows you to display RPM (Red Hat package manager) information.

Programming "One Liner" lookup terms:

rpm
Options used
-q = query
-i = information
-p = packages

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Send a message to all users - Programming One Liner 15

Broadcasting a message

wall

This programming one liner allows you to everyone connected to a terminal. Simply type wall, enter the message and press Ctrl-d to send it.

[root@plain user]# wall
fixed

Broadcast message from root (pts/0) (Sat Oct 29 22:52:36 2005):

fixed

Programming "One Liner" lookup terms:

wall

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Create and verify a tarball for a directory - Programming One Liner 14

tar - working with tarballs

tar -Wcvf /user/backups/site6-fst.tar etc home var >/designerz/backups/log.site6.fst.bk

This programming one liner allows you to create a verified archive. The command generates all files processed to the screen.

Programming "One Liner" lookup terms:

tar

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Process Information - Programming One Liner 12 - 13

ps - process information

ps 316

For a currently running process, you can use ps with the process id (pid) to see information about the process and to verify that its still running.

Programming "One Liner" lookup terms:

ps

Programming One Liner 13
See all processing currently running (started by you)

[root@plain html]# ps
PID TTY TIME CMD
20056 pts/5 00:00:05 bash
316 pts/5 00:07:53 tar
3302 pts/5 00:00:00 ps

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Restoring files from an old hard drive to new drive - Programming One Liner 11

Using rsync to restoring directories between two drives

rsync -vrplogDtH /olda/dir /home/dir

This programming one liner allows you to restore / copy files from one hard drive to another. This can be useful in cases when you have a hacked hard drive as slave attached to your web server and now you want to restore files.

Programming "One Liner" lookup terms:

rsync rcp

Brief explanation of options used with rsync for restoring files between hard drives.

-v, --verbose increase verbosity
-r, --recursive recurse into directories
-p, --perms preserve permissions
-l, --links copy symlinks as symlinks
-o, --owner preserve owner (root only)
-g, --group preserve group
-D, --devices preserve devices (root only)
-t, --times preserve times
-H, --hard-links preserve hard links

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Files and folders in a directory with ls and dir - Programming One Liner 5 - 10

Contents of a directory

This programming one liner allows you to see what files and directories are available within a folder on your Linux web server. Upon invocation of this one liner, the contents of your current directory (pwd) will be displayed.

ls

If you believe your ls binary is corrupt (due to a server hack) or just to use an alternate command, you can use the following command on Linux server to get the same results. dir and ls are infact two different binaries.

Programming One Liner # 6

dir

The following one liner will let you view detailed information about files and directories within your present directory. This command is commonly termed as "long listing format".

Programming One Liner # 7

ls -l

Similarly, you can use the long listing option with dir command.

Programming One Liner # 8

dir -l

This command can be used to view the listings with color codings (if supported by your Linux web server).

Programming One Liner # 9

ls --color=tty

To make the color coded listings part of your profile, simply add the following lines to your .bash_profile directory. You can also execute this command to just color code the listings for your current session.

Programming One Liner # 10

alias ls='ls --color=tty'

Programming "One Liner" lookup terms:

ls dir

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Total Disk used by a file or directory server - Programming One Liner 4

Directory Disk Usage

du -h -s site6-www.tar.defunct

This programming one liner allows you to view total disk used by a folder or file on a server in a summarized and readable format.

Programming "One Liner" lookup terms:

df du

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Remove Server Directory - Programming One Liner 3

Removing a directory on server

rm -r -f /tmp/directory

This programming one liner allows you to recursively, completely and forcefully remove the directory.

Programming "One Liner" lookup terms:

rm unlink

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Frank Mash (Frankly Speaking)

Server Backup - Programming One Liner 2

Server directory backup

cd /user/backups; ls -1 /oldb2/home/virtual/ | grep site | grep -v '-' | while read i; do bkdir=/oldb2/home/virtual/$i; echo $i; echo $bkdir; tar -cf $i-www.tar $bkdir/fst/var/www; echo "Gunzip $i"; gzip $i-www.tar; ls -l $i-www.tar.gz; done

This programming one liner allows you to backup directories. First it makes a tarball of a directory and then uses gzip to compress the tarballs.

Programming "One Liner" lookup terms:

ls, grep, tar, ls, gzip

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Disk usage human readable - Programming One Liner 1 - Linux

df -h

This programming one liner allows you to view disk usage in human readable format

Programming "One Liner" lookup terms:

man df

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Programming one liners - Sophisticated, Productive, Time Saving - Programming at the Extreme

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