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Old 12-23-2007, 03:16 AM   #1
anandv_1234
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Question How to run a shell script in a background?


Dear Folks,

I wanted to run a particular shell program in a background,
how do we do that...


i have another query also, that is how to find a creation date of the file..

Thanks in advance..


Thanks and Regards,
V.Anand,
Bangalore.
 
Old 12-23-2007, 03:46 AM   #2
the_imax
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but an & at the end of the command to run it in background

like
./myscript&

this will keep your terminal free and command will keep running in background

I am not sure about the file creation date, may be someone else can help
 
Old 12-23-2007, 04:01 AM   #3
UgoBoss
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Quote:
Originally Posted by anandv_1234 View Post
i have another query also, that is how to find a creation date of the file..
This is not possible: unix stores only time of last access, time of last modification and time of last inode change
 
Old 12-23-2007, 04:03 AM   #4
matthewg42
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Note that for most commands, if you run them in the background using the & after the command, they will terminate when the terminal is closed. This is because the operating system sends the SIGHUP (hang up) signal to background jobs when a terminal closes, and mos programs terminate on receipt of this signal.

You can prevent the signal from getting to the program by starting it like this:
Code:
nohup command &
The nohup stands for "no hangup", referring to the signal mentioned above.

As for the time, unix-like filesystems do not store the creation time for files. You have three time stamps to choose from:
  1. atime - the time the file was last accessed (e.g. read)
  2. mtime - the time the file contents were last modified (e.g. appended to)
  3. ctime - time of last change to the file contents or the file meta-data (e.g. permissions change).
Probably the one you want is the mtime. You can get this for a specific file using the stat command, like this:
Code:
stat -c %y filename
Of using the -l option to ls will also display the mtime, although the format changes more, so if you are trying to use it in a script, the stat method is probably more suitable.
 
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