Extract rpm/jar/tar/iso in Windows 7

Windows 7-Zip from All Programs Menu

How about extracting .rpm/iso/tar/jar files on windows 7 machine?

Once of the best utilities i have come across in recent years in 7-Zip. I was particularly interested in jar, tar, iso and rpm files extraction. Other than these four  extensions, 7-Zip supports a number of other compression and non-compression archive formats (both for packing and unpacking) including 7z, ZIP, GZip, bzip2, xz and WIM. The utility also supports unpacking APM, ARJ, CHM, cpio, DEB, FLV, JAR, LHA/LZH, LZMA, MSLZ, onepkg, RAR, RPM, smzip, SWF, XAR and Z archives and CramFS, DMG, FAT, HFS, ISO, MBR, NTFS, SquashFS, UDF and VHD disk images.

7-Zip can open some MSI files, allowing access to the meta-files within along with the main contents. Some Microsoft CAB (LZX compression) and NSIS (LZMA) installer formats can be opened. Similarly, some Microsoft executable programs (.EXEs) which are self-extracting archives or otherwise contain archived content (e.g., some setup files) may be opened as archives.

The utility can be downloaded from here:
http://www.7-zip.org/download.html

fuser and pfiles: lsof equivalent in Solaris

Lets talk about lsof. It displays information about files which are opened by running(active) processes. An open file may be a regular file like text file or any script, directory, NFS file, block special file, character special file, shared library, regular pipe, named pipe, symbolic link, socket, anything. In Unix, we consider everything is a file, so you can think of how incredibly smart utility lsof is. Generally it is supplied with Linux.

But the question is, what is its Solaris equivalent? 

After some hit and misses i have managed to run an equivalent command. fuser. The fuser syntax that worked for me is :

sudo fuser -vm / 2>&1 | awk '$3 ~ /f|F/' | less

Another one is pfiles. It is not necessarily supplied with the default package.

pfiles /proc/*

Run fsck on a filesystem to repair it..

fsck -y -o b=32 /filesystem

This will repair the corrupted file system to its best and restore the data in /filesystem/lost+found directory. Data in this directory will have "#inode name" nomenclature. From there the data can be copied back to the filesystem. Ofcourse the techie who is repairing the FS must have prior knowledge about the directory structure in filesystem otherwise he would not be able to decide where to copy which file from lost+found directory. 

Note: This is system administrator's work, so please do not run mount/umount/fsck sort of commands with minimal knowledge. The fsck command can have other parameters as well. So depending on the need of the work, one can decide the exact fsck command. Above fsck command is most generic one i came across and applied while **working on real time issues**. Also please keep in mind that the filesystem has to be unmounted first (umount /filesystem) then run fsck and then mount (mount /filesystem /mountpoint) the filesystem back if properly repaired. Then only you will be able to see the files for restore in /lost+found directory.

Find files which are older than 15 minutes in Linux and Solaris..

The below example is for moving (mv) files, same can be changes easily for rm, ls, cp etc. One has to make change in xargs paramaeter.

In LINUX:
=========

find /path_to_directory/ -name "*.rpt" -type f -mmin +15 | xargs -I {} mv {} /target_directory_path/


In Solaris:
===========

#! /usr/bin/sh

#### Create a reference file minute_test
touch /path_to_directory/minute_test

#### Make minute_test 15 minutes old
sleep 900

#### Move all .rpt files to some other directory which are older than reference file minute_test
find /path_to_directory/ -name "*.rpt" -type f -newer minute_test | xargs -I {} mv {} /target_directory_path/

#### Remove reference file
rm -f /path_to_directory/minute_test

Count the number of occurances of a pattern in a file using awk

awk '{ for (i=1;i<=NF;i++) if ( $i == "word" ) count++ } END{print count}' filename

This will print the count of the occurance of  a pattern "word" in a file.

How to compare the values of a column in awk in a same file and consecutive lines..

If one would like to compare the values of 2nd column of consecutive lines of same file in such a way so that if the difference between first value and second value is more than 100 it should print complete line else ignore line.

Input File:

=======

ABC 2500

ABCD 123

XYZ 122

WXYZ 2565

Desired Output:

==========

ABC 2500 (i.e. difference between 2500 and 123 is greater than 100 here)

XYZ 122 (i.e. difference between 122 and 2565 is greater than 100 here)

Command:

=======

awk 'NR % 2 != 0 {a=$1; b=$2} NR % 2 == 0 {if (b - $2 > 100 || $2 - b > 100){print a,b}}' inputfile