Question 39094 in Ubuntu Question posted in
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How can I remove the characters or text to show only the PID in terminal. Ubuntu/Linux terminal

How can I remove the characters/texts from this output?
I’ve been trying to sed/cut but I cant really do it.

My command:

xprop -id $(xprop -root 32x 't$0' _NET_ACTIVE_WINDOW | cut -f 2) _NET_WM_PID

Output:

_NET_WM_PID(CARDINAL) = 3239

Expected output:

3239
Tags:

2

Answers


  1. Chosen as BEST ANSWER
    0 
    sed -E 's#.*/([0-9]*).*#1#g' file.txt

  2. 0

    You can do this using cut alone. Note that the cut command has the argument -d which defaults to tab but you can pass other delimiter.

    xprop -id $(xprop -root _NET_ACTIVE_WINDOW | cut -d# -f2) _NET_WM_PID | cut -d  -f3

    Lets break this down into its parts, and start at the inside.

    • xprop -root _NET_ACTIVE_WINDOW | cut -d# -f2 select the id, by using the pound symbol as delimiter for cut, the first field is everything before the # and the second field is everything behind the first #, here it is the id
    • $( ... ) is replaced by the result of the command inside the parens, here that is the id
    • xprop -id $( ... ) _NET_WM_PID | cut -d -f3 the outer xprop result can be cutted at the space, which give use three fields:
      • _NET_WM_PID(CARDINAL)
      • =
      • the value (without leading space as one would get by using = as delimiter)
    • Note that we use -d to specify "space as delimiter", we need to escape the space with a backslash.
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