Whois, whatis, which command not found – Install Whois Whatis which command
whois command not found on Linux Server – How to Install Whois Command
-bash: whois: command not found
How to install whois command on linux server
1. Login to your linux server via SSH as root user
2. Type the command “rpm -qa | grep whois” to check whether the package is installed
root@server [~]# rpm -qa | grep whois
OR
root@server [~]# rpm -qa | grep jwhois
If whois package is installed then it will show the below result.
root@server [~]# rpm -qa | grep whois
whois-5.1.1-2.el7.x86_64
3. Type “yum install whois” command to download and install whois package
-bash: whois: command not found
root@server [~]# yum install whois
–> Running transaction check
—> Package whois.x86_64 0:5.1.1-2.el7 will be installed
–> Finished Dependency Resolution
Dependencies Resolved
Total download size: 72 k
Installed size: 222 k
Is this ok [y/d/N]: y
Downloading packages:
whois-5.1.1-2.el7.x86_64.rpm | 72 kB 00:00:00
Installing : whois-5.1.1-2.el7.x86_64 1/1
Verifying : whois-5.1.1-2.el7.x86_64 1/1
Installed:
whois.x86_64 0:5.1.1-2.el7
Complete!
root@server [~]#
Now whois package is installed on the above server. On some linux distributions the package is different so you must install jwhois instead of whois package. “Yum install jwhois”
To uninstall/remove the whois package you should run the command “yum remove whois” on the server
whatis: command not found – How to Install whatis command on linux
root@server [~]# /usr/bin/whatis
-bash: /usr/bin/whatis: No such file or directory
OR
root@server [~]# whatis
-bash: whatis: command not found
Whatis command might not be installed on your server and that is the reason why you are getting this error.
How to install whatis command on linux server
1. Log into your CentOS/Redhat server via SSH as root
2. Type the command “rpm -qa | grep man-db” to check whether the package is installed or not
3. Install the package man-db using yum
Just type “yum install man-db” like shown below
Resolving Dependencies
—> Package man-db.x86_64 0:2.6.3-9.el7 will be installed
–> Finished Dependency Resolution
Total download size: 559 k
Installed size: 1.8 M
Is this ok [y/d/N]: y
Downloading packages:
man-db-2.6.3-9.el7.x86_64.rpm | 559 kB 00:00:00
Installing : man-db-2.6.3-9.el7.x86_64 1/1
Verifying : man-db-2.6.3-9.el7.x86_64 1/1
Installed:
man-db.x86_64 0:2.6.3-9.el7
Complete!
whatis command is successfully installed and you won’t see any errors.
whatis 2.6.3
root@server [~]# whatis
whatis what?
which command not found – How to install which command on linux server
[root@server ~]# which php
-bash: /usr/bin/which: No such file or directory
OR
[root@server ~]# which php
-bash: which: command not found
which command is not installed on the above server and that is the reason why you’re getting the above error.
How to install which Command on Linux Server
1. Log into server via SSH as ‘root’ user
2. Type “rpm -qa | grep which” command to check whether which package is installed or not.
[root@server /]# rpm -qa | grep which
[root@server /]#
3. Run the command “yum install which” to install which package
[root@server /]# yum install which
—> Package which.x86_64 0:2.19-6.10.amzn1 will be installed
–> Finished Dependency Resolution
Total download size: 41 k
Installed size: 71 k
Is this ok [y/d/N]: y
Downloading packages:
which-2.19-6.10.amzn1.x86_64.rpm | 41 kB 00:00
Installing : which-2.19-6.10.amzn1.x86_64 1/1
Verifying : which-2.19-6.10.amzn1.x86_64 1/1
Installed:
which.x86_64 0:2.19-6.10.amzn1
Complete!
Which command is installed on the above server. Type to below command to confirm whether it is installed correctly.
[root@server /]# which php
/usr/local/bin/php