How to use/run bash aliases over ssh based session
======
SSH client (ssh) is a Linux/Unix command for logging into a remote server and for executing shell commands on a remote system. It is designed to provide secure encrypted communications between two untrusted machines over an insecure network such as the Internet.
## How to run or execute commands with Linux ssh client
I have [set up a bash alias named file_repl][1] . It works entirely when I log in using ssh command. However, my bash aliases are not running over ssh, for example:How do I run bash shell aliases when I use ssh command?SSH client (ssh) is a Linux/Unix command for logging into a remote server and for executing shell commands on a remote system. It is designed to provide secure encrypted communications between two untrusted machines over an insecure network such as the Internet.
To run a free command or [date command][2] with ssh:
`$ ssh [[email protected]][3] date`
Sample outputs:
```
Tue Dec 26 09:02:50 UTC 2017
```
OR
`$ ssh [[email protected]][3] free -h`
Sample outputs:
```
total used free shared buff/cache available
Mem: 2.0G 428M 138M 145M 1.4G 1.1G
Swap: 0B 0B 0B
```
total used free shared buff/cache available Mem: 2.0G 428M 138M 145M 1.4G 1.1G Swap: 0B 0B 0B
## Understanding bash shall and command types
The [bash shell understands][4] the following types of commands:
1. Aliases such as ll
2. Keywords such as if
3. Functions (user defined functions such as genpasswd)
4. Built in such as pwd
5. Files such as /bin/date
The [type command][5] or [command command][6] can be used to find out a command type:
```
$ type -a date
date is /bin/date
$ type -a free
free is /usr/bin/free
$ command -V pwd
pwd is a shell builtin
$ type -a file_repl
is aliased to `sudo -i /shared/takes/master.replication'
```
Both date and free are an external commands and file_repl is aliased to sudo -i /shared/takes/master.replication. One can not simply execute aliased command such as file_repl:
```
$ ssh user@remote file_repl
```
## Bash aliases not running or working over ssh client on Unix based system
1.**-t** :[ Force pseudo-terminal allocation. This can be used to execute arbitrary][7] screen-based programs on a remote machine, which can be very useful. With the -t option you will get an error that read as " bash: cannot set terminal process group (-1): Inappropriate ioctl for device. bash: no job control in this shell. "
Where bash shell options:
1.**-i** : Make the shell is interactive so that it can run bash aliases
2.**-c** : Commands are read from the first non-option argument command_string. If there are arguments after the command_string, they are assigned to the positional parameters, starting with $0.
In short run the following command to run a bash aliases called ll:
`$ ssh -t [[email protected]][3] -ic 'll'`
Sample session:
[![Running bash aliases over ssh based session when using Unix or Linux ssh cli][8]][8]
