RHEL / CentOS: Install and Activate Bash Autocomplete Feature
Installation
First, turn on the EPEL repo and type the following yum command to install bash-completion package:
# yum install bash-completion
Sample outputs:
Loaded plugins: product-id, rhnplugin, security, subscription-manager This system is not registered to Red Hat Subscription Management. You can use subscription-manager to register. This system is receiving updates from RHN Classic or RHN Satellite. Setting up Install Process Resolving Dependencies --> Running transaction check ---> Package bash-completion.noarch 1:1.3-5.el6 will be installed --> Finished Dependency Resolution Dependencies Resolved ================================================================================ Package Arch Version Repository Size ================================================================================ Installing: bash-completion noarch 1:1.3-5.el6 epel 215 k Transaction Summary ================================================================================ Install 1 Package(s) Total download size: 215 k Installed size: 576 k Is this ok [y/N]: y Downloading Packages: bash-completion-1.3-5.el6.noarch.rpm | 215 kB 00:00 Running rpm_check_debug Running Transaction Test Transaction Test Succeeded Running Transaction Installing : 1:bash-completion-1.3-5.el6.noarch 1/1 Verifying : 1:bash-completion-1.3-5.el6.noarch 1/1 Installed: bash-completion.noarch 1:1.3-5.el6 Complete!
How do I use bash Autocomplete feature?
Then exits a login shell / ssh session and log back in using the following command:
# logout
Open a terminal or log in using ssh:
$ ssh [email protected]
Alternatively, use the following command to source completion code for bash:
$ . /etc/bash_completion
OR
$ source /etc/bash_completion
Usage examples
You need to simply press [TAB] key. The syntax is:
command [TAB] command arg[TAB][TAB] man da[TAB]
rpm usage
Type the following command (type rpm -qi ph followed by [TAB]):
$ rpm -qi ph[TAB][TAB] php php-cli php-common php-devel php-imap
yum usage
Type the following command:
$ yum [TAB][TAB] --assumeyes --enableplugin list search --cacheonly --enablerepo makecache --setopt check --errorlevel --nogpgcheck shell check-update --exclude --noplugins --showduplicates clean groupinfo --obsoletes --skip-broken --color groupinstall provides --tolerant --config grouplist --quiet update --debuglevel groupremove --randomwait upgrade deplist help reinstall --verbose --disableexcludes --help --releasever version --disableplugin history remove --version --disablerepo info repolist distro-sync install resolvedep downgrade --installroot --rpmverbosity
To search a package called lsof:
$ yum se[TAB] lsof
Or search and install on fly:
# yum in[TAB] ls[TAB] lshell.noarch lslk-debuginfo.x86_64 lsscsi-debuginfo.x86_64 lshw-gui.x86_64 lslk.x86_64 lsscsi.x86_64 lshw.x86_64 lsof-debuginfo.x86_64 lsyncd.x86_64
cryptsetup usage
Linux Unified Key Setup-on-disk-format (LUKS) allows you to encrypt whole disks and you can use cryptsetup command to mount or remount encrypted partition:
cryptsetup [TAB] luksOpen /dev/md[TAB]
Sample outputs:
Fig.01: cryptsetup on RHEL based system
A list of all commands supported by Autocomplete feature
Type the following command:
$ cd /etc/bash_completion.d
$ ls
Sample outputs:
autoconf gpg2 ntpdate shadow automake gzip open-iscsi smartctl bash-builtins iconv openssl sqlite3 bind-utils iftop perl ssh brctl ifupdown pkg-config strace bzip2 info pm-utils subscription-manager chkconfig ipmitool postfix tar configure iproute2 procps tcpdump coreutils iptables python util-linux cpio lsof quota-tools wireless-tools crontab lvm redefine_filedir xmllint cryptsetup lzma rfkill xmlwf dd make rpm xz dhclient man rsync yum.bash e2fsprogs mdadm scl.bash yum-utils.bash findutils module-init-tools service getent net-tools sh