Transform XML to CSV Format | Unix String Pattern Manipulation The Ugly Way Updated: Jun 22, 2020     Disclaimer: I do not claim the below method to be the best optimum method of transforming XML to CSV format on the Unix command p... Read More

30 Handy Bash Shell Aliases For Linux / Unix / MacOS Author: Vivek Gite Last updated: October 28, 2020 186 comments An bash shell alias is nothing but the shortcut to commands. The alias command allows the user to launch any command or group of... Read More

https://riptutorial.com/awk$$$$$ MATH: $$$$$ Find the remainder of 1 number divided by another use "%" -->>> echo 27 5 | awk '{print $1 % $2}' -->> 2 Comparisons: -->>> echo 4 5 | awk '{if ($1 < $2... Read More

10 Awk Tips, Tricks and Pitfalls Last updated 3 weeks ago Hi guys and girls, this is the first and only guest post on my blog. It's written by Waldner from #awk on FreeNode IRC Network. He works as a sysadmin and does shell scripting as a hob... Read More

#!/bin/bash # Read Password echo -n Password: read -s password echo # Run Command echo $password #!/bin/bash stty -echo printf "Password: " read PASSWORD stty echo printf "\n"   read -s -p "Password: " password $ help read read: read [-ers] [-... Read More

The while loop is the best way to read a file line by line in Linux. If you need to read a file line by line and perform some action with each line – then you should use a while read line construction in Bash, as this is the most proper way to do the... Read More

Sometimes you don’t want to leave Bash history, because it may contain some sensitive data like passwords. This article may help you to control your Bash history file. Clear Bash history completely Type the following command to clear all your B... Read More

Very often in bash scrips you need to ask for user input that requires a Yes or No answer. For example, you may want to put a quick “Are you sure?” prompt for confirmation before execution of some potentially dangerous part of a bash script. In this ... Read More

If you often create Bash scripts, you may sometimes need to get the length of a string or find out the length of a variable that stores some string. This short note shows how to find out the length of a string from the Linux command line and how to c... Read More

Sometimes you might need to run some command from the Linux command line and repeat it several times. There is a simple way to write a command once and have it executed N times using Bash loop FOR. In this short note you’ll find how to execute ... Read More

In the previous post, we talked about sed command and we saw many examples of using it in text processing and we saw how it is good in this, but it has some limitations. Sometimes you need something powerful, giving you more control to process data. ... Read More

An array is a variable containing multiple values may be of same type or of different type.  There is no maximum limit to the size of an array, nor any requirement that member variables be indexed or assigned contiguously. Array index starts with zer... Read More

https://docstore.mik.ua/orelly/bookshelfs.html   The Java Reference Library, version 1.3 The Java Enterprise CD Bookshelf, Version 1.0 The Perl CD Bookshelf, version 1.0 ... Read More

The current Unix epoch time is  1529656113   Convert epoch to human readable date and vice versa  [batch convert timestamps to human dates] GMT: Friday, 22 June 2018 07:40:23Your time zone: piątek, 22 czerwca 2018 09:40:23 GMT+02:00 DST Yr Mon D... Read More

#### pwd;clear;SERVER=`hostname`sleep 2;>/tmp/${SERVER};echo "##########################" >> /tmp/${SERVER};echo "DATE: " >> /tmp/${SERVER};echo "---------------------------------------------------------------------" >> /tmp/${SE... Read More

# Small script to display some interesting information about Physical Volumes DISP="1"; ls -l /dev/hdisk* | awk '{print $10 " " $5 $6}' | sed -e "s:/dev/::" -e "s/,/ /"  | while read DISK MAJOR MINORdo   SIZE=$(bootinfo -s $DISK)   LUN=$(... Read More

The Linux xargs command may not be a hugely popular command line tool, but this doesn't take away the fact that it's extremely useful, especially when combined with other commands like find and grep. If you are new to xargs, and want to und... Read More

Tutorial on using xargs, a UNIX and Linux command for building and executing command lines from standard input. Examples of cutting by character, byte position, cutting based on delimiter and how to modify the output delimiter. Estimated reading time... Read More

The xargs command is extremely useful when we combine it with other commands. This tutorials explains the usage of xargs command using few simple examples. These example will help you understand the basics of how xargs command works. But, once you un... Read More

Tunneling With SSH to Your Destination   January 2015 | by David Tansley   Print 1   Figure 1 Figure 2 With SSH, you can create a tunnel (port forwarding) to transfer data that will be encrypted. Using this tunnel, you can then connect t... Read More

Dealing with Funny Files   September 2015 | by David Tansley   Print 0     Sometimes AIX reports an odd file when you use an ls or find command but it’s not present on the system. It can be frustrating when you can’t remove it du... Read More

Utilities to Tidy Up Your Reports   October 2015 | by David Tansley   Print 0     We system administrators quite often have to generate reports either for ourselves or for management. When we generate reports, particularly ad-hoc ones, the o... Read More

Using Shell Redirection: All About the Here-Doc   June 2016 | by David Tansley   Print 1     When gathering information from remote AIX hosts using SSH (Secure Shell), it will definitely make your life a lot easier to write the commands with... Read More

Time conversion using Bash   This article show how you can obtain the UNIX epoch time (number of seconds since 1970-01-01 00:00:00 UTC) using the Linux bash "date" command. It also shows how you can convert a UNIX epoch time to a human reada... Read More

Convert a human readable date to epoch with a shell script on OpenBSD and Mac OS X Dates can be quite challenging. Especially if you systematically want to use dates, for example to compare what date is older. If you would like to convert this dat... Read More

How do I convert Epoch seconds to the current time under UNIX or Linux operating systems? Unix time, or POSIX time, is a system for describing points in time, defined as the number of seconds elapsed since midnight proleptic Coordinated Universal Ti... Read More

How to sort IP addresses in Linux Answer: When you have a file ip.txt contains a list of IP addresses, e.g. 127.0.0.2 127.0.0.1 10.10.10.1 To sort it, you can use the following command # sort -t. -k1,1n -k2,2n -k3,3n -k4,4n ip.txt 10.10.10.1 127.0.... Read More

Usuwanie początkowych / „wiodących” spacji z zmiennej: ZMIENNA="${ZMIENNA#"${ZMIENNA%%[![:space:]]*}"}" Usuwanie końcowych / „wleczących” spacji z zmiennej: ZMIENNA="${ZMIENNA%"${ZMIENNA##*[![:space:]]}"}" Read More

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I’ve been using the following grep invocations to trim comments out of config files     #grep ^[^#] /etc/httpd/conf/httpd.conf or #egrep -v "^#|^$" /etc/httpd/conf/httpd.conf or #grep -v "^#" /etc/httpd/conf/httpd.confsource: https://sysadminco... Read More

In this short post I will show you how you can quickly add a range of IPs on any RedHat based system. When you have to add many IPs to a system this can be quite handy and save a lot of time. Normally when you add a new IP to a network interface in a... Read More