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Full Discussion: string manipulation with tabs
Top Forums Shell Programming and Scripting string manipulation with tabs Post 302288790 by chebarbudo on Wednesday 18th of February 2009 03:09:12 AM
Old 02-18-2009
Thanks vgersh99 for your help.
Unfortunately, this doesn't work with bash and I'm not allowed to install other shells.
But I came up with this new solution:
Code:
patricio@videos:~$ cat myscript
for record in $(mysql ndtv -e 'SELECT CONCAT(id, "-", ip) FROM terminal ORDER BY ip' | sed '1d'); do
    ip=${record##*-}
    id=${record%%-*}
    echo -en "================================================================================\15"
    echo -n "Terminal $id ($ip) "
    if ping -c1 -w1 $ip > /dev/null 2>&1; then
        echo
        ssh root@$ip "$1";
    else
        echo 'UNREACHABLE '
    fi
done
patricio@videos:~$ ./myscript 'hostname'
Terminal 3 (172.16.100.162) ====================================================
terminal3
Terminal 4 (172.16.121.151) ====================================================
terminal4
Terminal 5 (172.16.121.152) ====================================================
terminal5
Terminal 19 (172.16.121.153) ===================================================
terminal18
Terminal 17 (172.16.121.154) UNREACHABLE =======================================
Terminal 6 (172.16.146.151) ====================================================
terminal6
Terminal 7 (172.16.146.152) ====================================================
terminal7
Terminal 14 (172.16.150.151) UNREACHABLE =======================================
patricio@videos:~$

Fot some reason that I don't understand, if I keep using while, only the first line is parsed:
Code:
patricio@videos:~$ cat myscript
mysql -u ndtv -pndtv ndtv -e 'SELECT CONCAT(id, "-", ip) FROM terminal ORDER BY ip' | sed '1d' | while IFS= read -r record; do
    ip=${record##*-}
    id=${record%%-*}
    echo -en "================================================================================\15"
    echo -n "Terminal $id ($ip) "
    if ping -c1 -w1 $ip > /dev/null 2>&1; then
        echo
        ssh root@$ip "$1";
    else
        echo 'UNREACHABLE '
    fi
done
patricio@videos:~$ ./myscript 'hostname'
Terminal 3 (172.16.100.162) ====================================================
terminal3
patricio@videos:~$

Can you identify the problem?
Santiago
 

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LEARN ABOUT LINUX

set_color

set_color(1)							       fish							      set_color(1)

NAME

       set_color - set_color - set the terminal color

set_color - set the terminal color
   Synopsis
       set_color [-v --version] [-h --help] [-b --background COLOR] [COLOR]

   Description
       Change the foreground and/or background color of the terminal. COLOR is one of black, red, green, brown, yellow, blue, magenta, purple,
       cyan, white and normal.

       o -b, --background Set the background color

       o -c, --print-colors Prints a list of all valid color names

       o -h, --help Display help message and exit

       o -o, --bold Set bold or extra bright mode

       o -u, --underline Set underlined mode

       o -v, --version Display version and exit

       Calling set_color normal will set the terminal color to whatever is the default color of the terminal.

       Some terminals use the --bold escape sequence to switch to a brighter color set. On such terminals, set_color white will result in a grey
       font color, while set_color --bold white will result in a white font color.

       Not all terminal emulators support all these features. This is not a bug in set_color but a missing feature in the terminal emulator.

       set_color uses the terminfo database to look up how to change terminal colors on whatever terminal is in use. Some systems have old and
       incomplete terminfo databases, and may lack color information for terminals that support it. Download and install the latest version of
       ncurses and recompile fish against it in order to fix this issue.

Version 1.23.1							  Sun Jan 8 2012						      set_color(1)
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