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Top Forums Shell Programming and Scripting How to fetch PIDs from the fuser command output Post 302407250 by bharath.gct on Wednesday 24th of March 2010 11:54:20 PM
Old 03-25-2010
How to fetch PIDs from the fuser command output

All,

I have to have my script wait for another script when it is being executed. I used
Code:
fuser -f scriptname

to get the PID of the script but when passed the PID to wait command, the command does not accept it as a PID.

Below is the example:

my.script1:
Code:
fuser_result=`fuser -f my.script2`
echo " PID using my.file is : $fuser_result"
wait $fuser_result
echo " Script2 Complete. Now continue processing"

Before I ran the script, I made sure my.script2 is open and being executed
my.script1 does not wait for my.script2 at all. The last echo statement runs immediately after the wait statement.

Also the echo PID statement gives me outputs like below:

I run:
Code:
 PID using my.file is : 3436698

II run:
Code:
 PID using my.file is : 3436698 942486

III run:
Code:
 PID using my.file is : 19734589

From this its clear that the wait command did not see the PIDs from fuser command as PIDs. Is there any way to format the same so that I can make my wait command work?

Also as shown in II run sometimes, I get more than 1 PID from fuser. Let me know how to handle those kind of situations too!

Let me know for any questions.

Thanks
Bharath
 

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IRSEND(1)							   User Commands							 IRSEND(1)

NAME
irsend - basic LIRC program to send infra-red commands SYNOPSIS
irsend [options] DIRECTIVE REMOTE CODE [CODE...] DESCRIPTION
Asks the lircd daemon to send one or more CIR (Consumer Infra-Red) commands. This is intended for remote control of electronic devices such as TV boxes, HiFi sets, etc. DIRECTIVE can be: SEND_ONCE - send CODE [CODE ...] once SEND_START - start repeating CODE SEND_STOP - stop repeating CODE LIST - list configured remote items SET_TRANSMITTERS - set transmitters NUM [NUM ...] SIMULATE - simulate IR event REMOTE is the name of a remote, as described in the lircd configuration file. CODE is the name of a remote control key of REMOTE, as it appears in the lircd configuration file. NUM is the transmitter number of the hardware device. For the LIST DIRECTIVE, REMOTE and/or CODE can be empty: LIST "" "" - list all configured remote names LIST REMOTE "" - list all codes of REMOTE LIST REMOTE CODE - list only CODE of REMOTE The SIMULATE command only works if it has been explicitly enabled in lircd. -h --help display usage summary -v --version display version -d --device use given lircd socket [/var/run/lirc/lircd] -a --address=host[:port] connect to lircd at this address -# --count=n send command n times EXAMPLES
irsend LIST DenonTuner "" irsend SEND_ONCE DenonTuner PROG-SCAN irsend SEND_ONCE OnkyoAmpli VOL-UP VOL-UP VOL-UP VOL-UP irsend SEND_START OnkyoAmpli VOL-DOWN ; sleep 3 irsend SEND_STOP OnkyoAmpli VOL-DOWN irsend SET_TRANSMITTERS 1 irsend SET_TRANSMITTERS 1 3 4 irsend SIMULATE "0000000000000476 00 OK TECHNISAT_ST3004S" FILES
/etc/lirc/lircd.conf Default lircd configuration file. It should contain all the remotes, their infra-red codes and the corresponding timing and wave- form details. DIAGNOSTICS
If lircd is not running (or /var/run/lirc/lircd lacks write permissions) irsend aborts with the following diagnostics: "irsend: could not connect to socket" "irsend: Connection refused" (or "Permission denied"). SEE ALSO
The documentation for lirc is maintained as html pages. They are located under html/ in the documentation directory. lircd(8), mode2(1), smode2(1), xmode2(1), irrecord(1), irw(1), http://www.lirc.org. irsend 0.9.0-pre1 October 2010 IRSEND(1)
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