06-18-2007
pdf of Unix Shell proramming by Yashwant kanetkar needed
Hi All,
im planning to scratch the shell prog.
Can anyone plz post me the pdf of Unix Shell proramming by Yashwant kanetkar.
Thx a lot in advance
by iliyas
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tryto(1) General Commands Manual tryto(1)
NAME
tryto - tries to run a command limited by a timeout or number of tries, can be used to run as svlogd(8) processor.
SYNOPSIS
tryto [-pPv] [-t sec] [-k ksec] [-n tries] prog
DESCRIPTION
prog consist of one or more arguments.
tryto runs and watches prog, feeding its standard input to prog's standard input. If prog exits with a return code other then 0, tryto
runs prog again after sleeping one second.
If the number of retries reaches the maximal number of tries, tryto prints an error message and gives up.
If the timeout sec seconds is reached and prog is still running, tryto sends a TERM signal to prog, waits ksec seconds for prog to termi-
nate, then sends a KILL signal if prog still is there, and exits as soon as possible.
OPTIONS
-t sec timeout. Set the timeout to send TERM to prog to sec seconds. Default is 180.
-k ksec
kill timeout. Set the timeout to send KILL to prog to ksec seconds. Default is 5.
-n tries
Set the maximal number of tries to tries. If prog exited with a return code other that 0, tryto tries to rewind standard input to
the beginning using lseek(2) before starting prog again. Default is 5.
-p processor. Use this option if you run tryto as a svlogd(8) processor (see below).
-P process group. Run prog in a new session and process group, and send signals on timeout to prog's process group instead of its pid.
-v verbose. Print verbose messages to standard error.
PROCESSOR
If tryto sees the -p option, tryto runs as a svlogd(8) or multilog(8) processor, making use of filedescriptors 4 and 5:
Before starting prog, tryto moves the filedescriptor 5 to 2, so all error messages from tryto and prog will be saved in svlogd(8)'s state
to be processed on the next run of tryto -p.
After starting prog, tryto first feeds all data it reads from filedescriptor 4 into prog's standard input, then all data from filedescrip-
tor 0.
If prog fails by timeout sec seconds or maximal number of tries, tryto prints all data from standard input to standard output, an error
message to standard error, and exits with 0.
EXIT CODES
If tryto itself fails, it returns 111.
If tryto runs as a svlogd(8) processor, tryto returns 0 in all other cases.
If prog was run successfully, tryto returns 0.
If prog failed by timeout, tryto returns 100.
If prog failed by maximal number of tries, tryto returns the last return code from prog.
SEE ALSO
socklog(8), uncat(1), svlogd(8), multilog(8), lseek(2)
http://smarden.org/socklog/
http://smarden.org/runit/
AUTHOR
Gerrit Pape <pape@smarden.org>
tryto(1)