06-28-2013
How to detect that foreground process is waiting for input?
Hi,
I have to create a script (ksh or perl) that starts certain number of parallel jobs (another scripts), each of them runs as a foreground process in a separate session. Plus I start monitoring job that has to determine if any of those scripts is expecting input from operator, and switch to the corresponding session if necessary. My problem is that I have not found a good way to determine that process is expecting input. For the background process it's pretty easy: process state is "stopped" and this can be easily checked with 'ps' command. In case of foreground process this does not work. So far I tried to attach to the process with dbx or truss to see if it's hanging on 'read', but this approach seems too heavyweight. Could you suggest some better solution? Perl, shell, C, Java, etc. ... is ok as long as it's standard and does not require extra 3rd party or OS-specific stuff to install.
Thank you.
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LEARN ABOUT DEBIAN
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)