BASH
Enabling Bash History. First, let's check if history is enabled or not: $ set -o | grep history history on. In case history is turned off, we'll turn it on by setting in the .bashrc file: $ set -o history. After that, let's find out whether the file location and history size are set or not by using the echo command.
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You can do more with the Bash history command than just using the arrow keys. We show you how to use this command-line tool more efficiently. If you use the command line regularly, you probably use the Bash history file. Usually located in ~/.bash_history, the history file stores hundreds of previous shell commands, enabling you to reuse them.
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Bash scripting, collecting information in collection. Ask Question Asked 7 years, 1 month ago. Modified 7 years, 1 month ago. Viewed 2k times 2 I am new to the world of bash scripting. I am trying to do a simple task. trying to list all the logged in users and the process they are using.
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We can limit the output to the last N commands with the command history N. For example, history 2 will return the 2 most recent commands. history 2 6 echo "six" 7 history 2. You can pipe history into grep or less to make it easier to filter the output. history | grep ping 6 ping cherryservers.com 27 history | grep ping.
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You should look into the histappend shell option and the -a flag to history:. histappend. If set, the history list is appended to the file named by the value of the HISTFILE variable when the shell exits, rather than overwriting the file.. history-a Append the "new" history lines (history lines entered since the beginning of the current bash session) to the history file.
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To set an unlimited Bash history, we need to modify two environment variables, namely, HISTSIZE and HISTFILESIZE. They're simply variables that control the command history behavior. In terms of location, both these variables exist in ~/.bashrc, a Bash configuration file located in a user's home directory:
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The behavior of the Bash history can be defined using several different environment variables. When modifying the history behavior, set the variables in ~/.bashrc or any other configuration file which is loaded when the user logs in. By default Bash keeps 500 lines in the command history list. The HISTSIZE variable allows you to change this value.
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The Bash version of history allows for reverse searches, quick recall, rewriting history, and more. The history command isn't like many other commands. You might be used to commands being executable files placed in common system-level locations like /usr/bin, /usr/local/bin, or ~/bin. The built-in history command isn't in your PATH and has no.
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Bash includes search functionality for its history. The typical way of using this is through searching backwards in history (most recent results returned first) using the CTRL + R key combination. For instance, you can type CTRL + R, and begin typing part of the previous command.
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Bash is the GNU Project's shell—the Bourne Again SHell. This is an sh-compatible shell that incorporates useful features from the Korn shell (ksh) and the C shell (csh). It is intended to conform to the IEEE POSIX P1003.2/ISO 9945.2 Shell and Tools standard. It offers functional improvements over sh for both programming and interactive use.
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Hey guys, I just finished organizing my humble collection of bash scripts, and thought I'd share them in case others might find any of them useful. I enjoy automating, and have written scripts that automate things like nginx config creation, wordpress instance creation, etc. So yeah, let me know what you think!