root@test:/var/log/nginx# wget -qO – icanhazip.comwww.xxx.yyy.zzzroot@test:/var/log/nginx# wget -qO- http://ipecho.net/plain | xargs echowww.xxx.yyy.zzzroot@test:/var/log/nginx# wget -qO – icanhazip.comwww.xxx.yyy.zzzroot@test:/var/log/nginx# curl icanhazip.comwww.xxx.yyy.zzzroot@test:/var/log/nginx#
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To select all the lines starting from STARTING_PATTERN up to blank line ^$ and then delete those lines. # sed ‘/STARTING_PATTERN/,/^$/d’ filename To edit files in place, use -i option. # sed -i ‘/STARTING_PATTER/,/^$/d’ filename Insert multiple lines into a file after specified pattern. # sed ‘/cdef/r add.txt’ input.txt # sed ‘/cdef/r add.txt’ input.txt input.txt:abcdaccdcdeflineweb
sed to play with data or parsing your text Read More »
You can use the following methods to configure your console to use a proxy server so that console based programs like wget could get connect to the internet through the proxy. 1 – Set the environment variable # export http_proxy=http://DOMAIN\USERNAME:PASSWORD@SERVER:PORT/ # export ftp_proxy=http://DOMAIN\USERNAME:PASSWORD@SERVER:PORT/ In the above configuration you can ommit the DOMAIN\USERNAME:PASSWORD@ part if you
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The find utility on linux allows you to pass in a bunch of interesting arguments, including one to execute another command on each file. We’ll use this in order to figure out what files are older than a certain number of days, and then use the rm command to delete them. Command Syntax find /path/to/files* -mtime
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At the very least, collect the following information for each system that you have: 1. Hostname: % hostname 2. Hostname aliases: % grep `hostname` /etc/hosts | awk ‘{ print $3 }’ 3. Host network addresses: % grep `hostname` /etc/hosts | awk ‘{ print $1 }’ 4. Host ID: % hostid 5. System serial number: On
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Check if module is installed. Errors mean missing module. # perl -MModule::Name -e 1 See documentation of the module if installed. # perldoc Module::Name Open CPAN shell # perl -MCPAN -e shell To reconfigure the shell if needed. cpan>o conf init Install an available module. cpan> install HTML::Template You can run the Perl CPAN module
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Today vi is considered the standard. It is the only editor that will be installed by default on any UNIX system. It is small, fast and efficient; useful to make some minor editing of system files, editing of huge data files or when a slow network link is involved. It is important to learn at
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Shell scripts are text files that automate a series of UNIX environment-based commands that otherwise must be performed one at a time. Shell scripts are often used to automate command sequences that repeat, such as services that start or stop on system start up or shut down. Any command that can be performed from the
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Options are switches that control the behavior of the Korn shell. Options are boolean, meaning that they can be either on or off. To switch an option on, type: $ set -o option_name To switch an option off, type: $ set +o option_name To show current option settings, type: $ set -o Note: The set
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Functions are a powerful feature of shell programming used to construct customized commands. A function is a group of UNIX commands organized as separate routines. Using a function involves two steps: Define the function. Invoke the function. Defining a Function A function is defined using the general format: function_name { command; . . . command;
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