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hexdump - is a Linux utility to dump the file content into ascii, decimal, hexadecimal, octal formats. 

It accepts the input from a file or from standard input and creates a dump in ASCII, octal. hexadecimal or decimal formats.

      [-bcCdovx] [-e format_string] [-f format_file] [-n length] [-s skip] file ...


Category: Open System-Linux | Views: 1658 | Added by: shanky | Date: 2014-10-24 | Comments (0)

SETFACL - set file access control lists or set special permissions to a file or directory.

       setfacl [-bkndRLPvh] [{-m|-x} acl_spec] [{-M|-X} acl_file] file ...

       setfacl --restore=file

       This  utility  sets  Access  Control Lists (ACLs) of files and directories.  On the command line, a sequence of commands is followed by a sequence of files (which in turn can be followed by another sequence of commands, ...).

       The options -m, and -x expect an ACL on the command line. Multiple ACL entries are separated by comma characters (`,'). The options -M, and  -X ... Read more »

Category: Open System-Linux | Views: 1536 | Added by: shanky | Date: 2014-10-17 | Comments (0)

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getent - get entries from Name Service Switch libraries or administrative databases like passwd, shadow, group etc.

getent [Options..] database [key ...]


  • The getent command displays entries from databases supported by the Name Service Switch libraries, which are configured in /etc/nsswitch.
Category: Open System-Linux | Views: 2177 | Added by: shanky | Date: 2014-10-12 | Comments (0)

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TIME a simple command to give resource usage in Linux system

       time [options] command [arguments...]

       The  time command runs the specified program/command with the given arguments.  When command finishes, time writes a message to standard error giving timing statistics about the program run.  

... Read more »

Category: Open System-Linux | Views: 1232 | Added by: shanky | Date: 2014-10-06 | Comments (0)

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The command is used to configure kernel parameters at runtime

Most frequent usage:

  1. Enable/disable IP forwarding
  2. Change/Edit network configuration for ipv4/ipv6
  3. Change/Edit kernel parameters like hostaname, domainname, max_lock_depth. ostype, pid_max etc
  4. Change/edit file system
Category: Open System-Linux | Views: 1409 | Added by: shanky | Date: 2014-10-04 | Comments (0)

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The command is used to get all the hops through which the packet is passing.

       traceroute  tracks  the  route  packets take across a TCP/IP network on their way to a given host.

See the same command TRACERT in windows command line

How it works

Category: Open System-Linux | Views: 2021 | Added by: shanky | Date: 2014-09-26 | Comments (0)

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SHOPT : Toggle the values of variables controlling optional shell behavior.


 shopt [-pqsu] [-o] [optname ...]

   With no options, or with  the  -p option, a list of all settable options is displayed, with an indication of whether or not each is set.

... Read more »

Category: Open System-Linux | Views: 1361 | Added by: shanky | Date: 2014-09-24 | Comments (0)

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Here in this article, we will learn how to change your command prompt strings in Linux environment or keep a prompt string of your own choice.

Before we change the command prompt strings, we need to learn the global variables $PS1, $PS2, $PS3, $PS4. Because these are the variable which defines the prompt strings. So lets have a look at short description on them.

  • PS1: This is the global variable used to define the main prompt string in linux environmen
Category: Open System-Linux | Views: 1273 | Added by: shanky | Date: 2014-09-21 | Comments (0)

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EXPORT is one of the most useful command in linux. It is used to set global variables in linux environment


export [-fn] [name[=word]] ...
export -p

              Names supplied to export are marked for automatic export to the environment of 


Category: Open System-Linux | Views: 1277 | Added by: shanky | Date: 2014-09-20 | Comments (0)

       md5sum - compute and check MD5 message digest

       md5sum [OPTION] [FILE]...

       Print  or  check  MD5 (128-bit) checksums.  With no FILE, or when FILE is -, read standard input.

       -b, --binary
              read in binary mode

       -c, --check
              read MD5 sums from the FILEs and check them

   &n ... Read more »

Category: Open System-Linux | Views: 1277 | Added by: shanky | Date: 2014-09-13 | Comments (0)