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wiki:using_aliases_in_centos [2016/07/25 12:12] – walkeradminwiki:using_aliases_in_centos [2016/07/25 12:14] – walkeradmin
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 ====== Using Aliases in CentOS ====== ====== Using Aliases in CentOS ======
-\\  +
-\\  +
-Aliases are a way of assinging a complex command to an easy to remember word. Looking at the command below: +
-\\  +
-        ip addr |grep '[0-9]\{1,3\}\.[0-9]\{1,3\}\.[0-9]\{1,3\}\.[0-9]\{1,3\}' +
-\\  +
-This returns just the IP part of the output from an //**ip addr**// command, making the output much easier to read, however remembering and typing the command requires more effort than it saves. For this then we can create an alias. +
-\\  +
-\\  +
-I want an alias called **showip** that acutally does the same as typing ip addr |grep '[0-9]\{1,3\}\.[0-9]\{1,3\}\.[0-9]\{1,3\}\.[0-9]\{1,3\}' +
-\\  +
-\\  +
-You need to edit the .bash file for the logged in user who will use this alias. I am logged in as root, so I will edit that bash file.\  +
-\\  +
-Navigate to root: +
-\\  +
-     cd /root +
-\\  +
-Show the list of files: +
-\\  +
-     ls -al to show file list, you will see a list of files, including one called .bashrc\\  +
-\\  +
-Edit the .bashrc file by entering: +
-\\  +
-      sudo nano /root/.bashrc +
-\\  +
-My default .bashrc file looks like this: +
-\\  +
-    # ~/.bashrc: executed by bash(1) for non-login shells. +
-    # see /usr/share/doc/bash/examples/startup-files (in the package bash-doc) +
-    # for examples +
-     +
-    # If not running interactively, don't do anything +
-    case $- in +
-        *i*) ;; +
-          *) return;; +
-    esac +
-     +
-    # don't put duplicate lines or lines starting with space in the history. +
-    # See bash(1) for more options +
-    HISTCONTROL=ignoreboth +
-     +
-    # append to the history file, don't overwrite it +
-    shopt -s histappend +
-     +
-    # for setting history length see HISTSIZE and HISTFILESIZE in bash(1) +
-    HISTSIZE=1000 +
-    HISTFILESIZE=2000 +
-     +
-    # check the window size after each command and, if necessary, +
-    # update the values of LINES and COLUMNS. +
-    shopt -s checkwinsize +
-     +
-    # If set, the pattern "**" used in a pathname expansion context will +
-    # match all files and zero or more directories and subdirectories. +
-    #shopt -s globstar +
-         +
-    # make less more friendly for non-text input files, see lesspipe(1) +
-    #[ -x /usr/bin/lesspipe ] && eval "$(SHELL=/bin/sh lesspipe)" +
-     +
-    # set variable identifying the chroot you work in (used in the prompt below) +
-    if [ -z "${debian_chroot:-}" ] && [ -r /etc/debian_chroot ]; then +
-        debian_chroot=$(cat /etc/debian_chroot) +
-    fi +
-     +
-    # set a fancy prompt (non-color, unless we know we "want" color) +
-    case "$TERM" in +
-        xterm-color) color_prompt=yes;; +
-    esac +
-     +
-    # uncomment for a colored prompt, if the terminal has the capability; turned +
-    # off by default to not distract the user: the focus in a terminal window +
-    # should be on the output of commands, not on the prompt +
-    force_color_prompt=yes +
-     +
-    if [ -n "$force_color_prompt" ]; then +
-        if [ -x /usr/bin/tput ] && tput setaf 1 >&/dev/null; then +
-            # We have color support; assume it's compliant with Ecma-48 +
-            # (ISO/IEC-6429). (Lack of such support is extremely rare, and such +
-            # a case would tend to support setf rather than setaf.) +
-            color_prompt=yes +
-        else +
-            color_prompt= +
-        fi +
-    fi +
-     +
-    if [ "$color_prompt" = yes ]; then +
-        PS1='${debian_chroot:+($debian_chroot)}\[\033[01;32m\]\u@\h\[\033[00m\]:\[\033[01;34m\]\w \$\[\033[00m\] ' +
-    else +
-        PS1='${debian_chroot:+($debian_chroot)}\u@\h:\w\$ ' +
-    fi +
-    unset color_prompt force_color_prompt +
-     +
-    # If this is an xterm set the title to user@host:dir +
-    case "$TERM" in +
-    xterm*|rxvt*) +
-        PS1="\[\e]0;${debian_chroot:+($debian_chroot)}\u@\h: \w\a\]$PS1" +
-        ;; +
-    *) +
-        ;; +
-    esac +
-     +
-    # enable color support of ls and also add handy aliases +
-    if [ -x /usr/bin/dircolors ]; then +
-        test -r ~/.dircolors && eval "$(dircolors -b ~/.dircolors)" || eval "$(dircolors -b)" +
-        alias ls='ls --color=auto' +
-        #alias dir='dir --color=auto' +
-        #alias vdir='vdir --color=auto' +
-     +
-        alias grep='grep --color=auto' +
-        alias fgrep='fgrep --color=auto' +
-        alias egrep='egrep --color=auto' +
-    fi +
-     +
-    # colored GCC warnings and errors +
-    #export GCC_COLORS='error=01;31:warning=01;35:note=01;36:caret=01;32:locus=01:quote=01' +
-     +
-    # some more ls aliases +
-    #alias ll='ls -l' +
-    #alias la='ls -A' +
-    #alias l='ls -CF' +
-     +
-    # Alias definitions. +
-    # You may want to put all your additions into a separate file like +
-    # ~/.bash_aliases, instead of adding them here directly. +
-    # See /usr/share/doc/bash-doc/examples in the bash-doc package. +
-     +
-    if [ -f ~/.bash_aliases ]; then +
-        . ~/.bash_aliases +
-    fi +
-     +
-    # enable programmable completion features (you don't need to enable +
-    # this, if it's already enabled in /etc/bash.bashrc and /etc/profile +
-    # sources /etc/bash.bashrc). +
-    if ! shopt -oq posix; then +
-      if [ -f /usr/share/bash-completion/bash_completion ]; then +
-        . /usr/share/bash-completion/bash_completion +
-      elif [ -f /etc/bash_completion ]; then +
-        . /etc/bash_completion +
-      fi +
-    fi +
-\\  +
-\\  +
-Now add the new alias: +
-\\  +
-        alias showip=" ip addr |grep '[0-9]\{1,3\}\.[0-9]\{1,3\}\.[0-9]\{1,3\}\.[0-9]\{1,3\}'" +
-\\ +
-save the file and exit: +
-\\  +
-        ctrl-x - yes - enter +
-\\  +
-You have to restart the bash for any new aliases to work +
-\\  +
-        . .bashrc +
-\\  +
-If you want to see if the alias is now listed, from the command prompt just type: +
-\\  +
-        alias +
-\\  +
-You should now be able to type your new command at the command line and get an output: +
-\\  +
-        showip +
-            inet 127.0.0.1/8 scope host lo +
-            inet 192.168.27.30/24 brd 192.168.27.255 scope global eth0 +
-\\  +
-\\ +
wiki/using_aliases_in_centos.txt · Last modified: 2023/03/09 22:35 by 127.0.0.1