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Thread: use sed delete everything before the 1st number

  1. #1
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    use sed delete everything before the 1st number

    i need to delete some junk in a line of text there is some kind of special character that does not show up
    i need to trim some really strange non-printable character(s) at the front of each line this command generates
    Code:
    top -n 1 -u $USER | grep $USER
    this strange character actually uses 3 characters
    if i can delete everything before the 1st number i should be good to go
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  2. #2
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    Re: use sed delete everything before the 1st number

    There's some gubbins at the end of line to remove too.
    Code:
    top -n 1 -u $USER | grep $USER | sed 's/^[^0-9]*//' | sed 's/[:cntrl:].*//'

  3. #3
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    Re: use sed delete everything before the 1st number

    not working , BTW you can combine 2 sed commands like this
    Code:
    sed 's/^[^0-9]*//;s/[:cntrl:].*//'
    the pid should be 1st, i think the code to make a line bold is the issue
    Code:
    ~$ top -n 1 -u $USER | grep $USER | sed 's/^[^0-9]*//' | sed 's/[:cntrl:].*//'
    1m 3955 
    1834 
    1845 
    1884 
    1887 
    1888 
    1895 
    1897 
    1905 
    1909 
    1911 
    1913
    i am trying to isolate the cpu usage, i did manage to pull it of like this
    Code:
    top=`top -n 1 -p "$flash" | grep $USER | head -1 | sed "s/\.//g;s/$USER/\n/" | tail -1 | awk '{print $7}'`
    i removed the decimals cause bash hates non-hole numbers
    Laptop: ASUS A54C-NB91 (Storage: WD3200BEKT + MKNSSDCR60GB-DX); Desktop: Custom Build - Images included; rPi Server
    Putting your Networked Printer's scanner software to shame PHP Scanner Server
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  4. #4
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    Re: use sed delete everything before the 1st number

    If you only want to isolate the cpu usage stat, couldn't you just use awk the grab the fields you want?
    Code:
    top -n 1 -u $USER | grep $USER | awk '{ OFS="\t"; print $2,$3,$10 }' -
    Otherwise, I think it's the color escape characters that you're seeing (maybe a sample of your output would help identify it), and I found this sed command before to help get rid of those characters:

    Code:
    top -n 1 -u $USER | grep $USER | sed -r "s/\x1B\[([0-9]{1,2}(;[0-9]{1,2})?)?[m|K]//g"
    Does that help?

    EDIT: Actually might be able to get away with simplifying that a bit:

    Code:
    top -n 1 -u $USER | grep $USER | sed -r "s:\x1B\[[0-9;]*[mK]::g"
    Last edited by drmrgd; October 12th, 2012 at 01:44 AM.

  5. #5
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    Re: use sed delete everything before the 1st number

    Quote Originally Posted by drmrgd View Post
    If you only want to isolate the cpu usage stat, couldn't you just use awk the grab the fields you want?
    cpu keeps changing between 9 and 10 cause of the bold being there sometimes
    this is what hte bold keeps doing
    Code:
    ~$ echo " PID CPU NAME";top -n 1 -u $USER | grep $USER | sed -r "s:\x1B\[[0-9;]*[mK]::g" | awk '{print $2" "$10" "$13}'
     PID CPU NAME
    chad 0.0 
    1834 0.0 gnome-keyring-d
    1845 0.0 sh
    1884 0.0 ssh-agent
    1887 0.0 dbus-launch
    1888 0.0 dbus-daemon
    1895 0.0 xfce4-session
    1897 0.0 xfconfd
    1905 0.0 xfwm4
    1909 0.0 xfce4-panel
    1911 0.0 Thunar
    1913 0.0 xfdesktop
    1916 0.0 gvfsd
    1920 0.0 gvfsd-fuse
    1928 0.0 python
    1930 0.0 gmusicbrowser
    1932 0.0 pidgin
    Last edited by pqwoerituytrueiwoq; October 12th, 2012 at 02:16 AM.
    Laptop: ASUS A54C-NB91 (Storage: WD3200BEKT + MKNSSDCR60GB-DX); Desktop: Custom Build - Images included; rPi Server
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  6. #6
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    Re: use sed delete everything before the 1st number

    I see the problem here. I'm not sure if this is the expected behavior or not, but I was able to get around this using the '-b' option of top:

    Code:
    echo " PID  CPU  NAME"; top -bn 1 -u $USER | grep $USER | awk '{ OFS="\t"; print $1,$2,$9 }' -
    Does that get you what you're looking for?

  7. #7
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    Re: use sed delete everything before the 1st number

    yes, but the column names are wrong
    Code:
    echo -e "PID\tCPU\tNAME"; top -bn 1 -u $USER | grep $USER | awk '{ OFS="\t"; print $1,$9,$12 }'
    bottom line that worked
    Laptop: ASUS A54C-NB91 (Storage: WD3200BEKT + MKNSSDCR60GB-DX); Desktop: Custom Build - Images included; rPi Server
    Putting your Networked Printer's scanner software to shame PHP Scanner Server
    I frequently edit my post when I have the last post

  8. #8
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    Re: use sed delete everything before the 1st number

    Quote Originally Posted by pqwoerituytrueiwoq View Post
    yes, but the column names are wrong
    Whoops! I was so focused on trying to get rid of those formatting escape characters I forgot to pay attention to the data output! Glad that worked.

  9. #9
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    Re: use sed delete everything before the 1st number

    the content did not matter, just that annoying escaped characters
    this is the line i ended up with
    Code:
    flash=`top -bn 1 -p "$flash" | grep $USER | head -1 | awk '{print $9*10}'`
    top on lucid uses a hole number for cpu usage and 12.10 has a decimal, i multiply by 10 to get rid of the decimal to make the number bash friendly
    i attached my final script, i made it to stop xscreensaver while flash/parole is running
    Attached Files Attached Files
    Laptop: ASUS A54C-NB91 (Storage: WD3200BEKT + MKNSSDCR60GB-DX); Desktop: Custom Build - Images included; rPi Server
    Putting your Networked Printer's scanner software to shame PHP Scanner Server
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  10. #10
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    Re: use sed delete everything before the 1st number

    That's pretty cool. I'm going to try that script out on my home computer. I think something like that could come in handy!

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