CODEWITHSUNDEEP
bashshellterminaltty
j0h
j0h

Reputation: 1784

how can I list terminals currently in use

I want to set the terminal my script is running in as a variable in a bash shell script. as in tty7, or pts/0 or ttyacm0 etc...

I tried printenv , sudo printenv and declare -xp but in the list I only saw ssh_term. But I know I have a script running in /dev/tty6 so it isnt listing all the terminals in use, just the current terminal.

is there a simple way to list all the shells in use?

UPDATE: who -a seems like all the terminals used in the uptime durration. the ones that say old are the ones where I know there are other scripts running. But what is this +/- business?

j0h      - tty6         2014-05-16 07:50  old         9593
LOGIN      tty1         2014-05-15 19:10              1675 id=1
j0h      + tty7         2014-05-15 19:13  old         1936

Upvotes: 1

Views: 1409

Answers (2)

Hastur
Hastur

Reputation: 2828

To obtain the current shell that you are using, there is the command

tty

that print the file name of the terminal connected to standard input e.g. /dev/pts/51

To see all the shell you can use w or who.

who -a and who -p should give you some information more...

Read the man to have a quick view on the possibilities. (You can select the user...)

Update:
Let we say your script is called MyScript.sh. If you add as a 1st line 

#!/bin/bash

you change the attribute 

chmod u+x MyScript.sh

and you execute it with ./MyScript.sh later you can search directly them with 

pgrep -wal MyScript.sh

(It will return the pid of the processes)

Upvotes: 1

PradyJord
PradyJord

Reputation: 2160

If I have understood the problem correctly you are looking for terminals used by a particular script, if so you can use something like:

x=($(ps aux | grep script_name)| awk '{print $7}') #you may have to check which column to filter

all terminals used by script would be in array x then you can

for i in ${x[*]}
do
echo $i
done

for getting individual values

Upvotes: 1

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