[SOLVED] Need a particular sed / grep command to solve problem

khandu · 11-18-2012, 02:35 AM

I am running some command in terminal.. and getting the following result

Code:

      VRAM (Total): 1024 MB

NOTE the gap in the starting..

Now I really want to create two commands.

1) remove the gap from start and give the result.. so result should be

Quote:

VRAM (Total): 1024 MB

and

2) Remove starting text entirely and just give

Quote:

1024 MB

Help please.. I am just playing around with geektool in mac and want to grab this part as a result..

catkin · 11-18-2012, 03:07 AM

A pure bash solution:

Code:

#!/bin/bash
shopt -s extglob  # Enable extended globbing
var='      VRAM (Total): 1024 MB'
var2=${var##*( )}  # The *( ... ) requires extended globbing
echo ">$var2<"
var3=${var#*: }
echo ">$var3<"

Extended globbing is explained here, at the end of the section.

khandu · 11-18-2012, 03:09 AM

Quote:

Originally Posted by catkin

A pure bash solution:

Code:

#!/bin/bash
shopt -s extglob  # Enable extended globbing
var='      VRAM (Total): 1024 MB'
var2=${var##*( )}  # The *( ... ) requires extended globbing
echo ">$var2<"
var3=${var#*: }
echo ">$var3<"

Extended globbing is explained here, at the end of the section.

thanks.. but forgot to mention..

it needs to be a one line terminal solution.. as I am grepping this in a command.. I want to extend the command to get the desired result.. i guess need some kind of regex to do this?

catkin · 11-18-2012, 03:13 AM

Quote:

Originally Posted by khandu

I want to extend the command to get the desired result.

In the OP you suggest you want two results. Do you actually want only the last result?

khandu · 11-18-2012, 03:20 AM

actually need two seperate results.. not in same command.. sorry for the confusion

so one command will give me 1 and second will give me 2..

so I guess I am looking for two seperate grep / sed commands..

catkin · 11-18-2012, 03:26 AM

Code:

c@CW9:~$ echo '      VRAM (Total): 1024 MB' | sed 's/^ *//'
VRAM (Total): 1024 MB
c@CW9:~$ echo '      VRAM (Total): 1024 MB' | sed 's/.*: //'
1024 MB

khandu · 11-18-2012, 03:34 AM

Quote:

Originally Posted by catkin

Code:

c@CW9:~$ echo '      VRAM (Total): 1024 MB' | sed 's/^ *//'
VRAM (Total): 1024 MB
c@CW9:~$ echo '      VRAM (Total): 1024 MB' | sed 's/.*: //'
1024 MB

Thanks