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Full Discussion: How to detect url in use in a script?
Top Forums Shell Programming and Scripting How to detect url in use in a script? Post 303027086 by baris35 on Saturday 8th of December 2018 04:08:22 PM
Old 12-08-2018
How to detect url in use in a script?
Hello,
I have a small script and it runs from web application in below format:
Code:
pipe:///path_to_myscript.sh url1 url2 url3

myscript.sh:
Code:
#!/bin/bash
count=0
while [ "$count" -lt "20" ]
do
count=$((count+1))
exec 3>&1
((ffmpeg -i $1 ...... -f mpegts pipe:1 2>/dev/null 1>&3 ) 2>&1 | \
while read LINE; do echo "$1 $LINE"; done 1>&2 ) 3>&1
PID=$!
wait ($PID)
if [ -n "$2" ]; then
((ffmpeg -i $2 ...... -f mpegts pipe:1 2>/dev/null 1>&3 ) 2>&1 | \
while read LINE; do echo "$2 $LINE"; done 1>&2 ) 3>&1
PID=$!
wait ($PID)
fi
if [ -n "$3" ]; then
((ffmpeg -i $3 ..... -f mpegts pipe:1 2>/dev/null 1>&3 ) 2>&1 | \
while read LINE; do echo "$3 $LINE"; done 1>&2 ) 3>&1
PID=$!
wait ($PID)
fi
sleep 1
done

When I run it, url1, or 2 or 3 runs but I am unable to see which one is in use and I do not wish to run iftop to detect. Htop is not giving any clue.
How may I change this script to be able to see the active url?

Thanks in advance
Boris
Last edited by baris35; 12-10-2018 at 05:46 AM.. Reason: latest update
 

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LEARN ABOUT OSX

rwsnoop

rwsnoop(1m)							   USER COMMANDS						       rwsnoop(1m)

NAME

       rwsnoop - snoop read/write events. Uses DTrace.

SYNOPSIS

       rwsnoop [-jPtvZ] [-n name] [-p PID]

DESCRIPTION

       This is measuring reads and writes at the application level. This matches the syscalls read, write, pread and pwrite.

       Since this uses DTrace, only users with root privileges can run this command.

OPTIONS

       -j     print project ID

       -P     print parent process ID

       -t     print timestamp, us

       -v     print time, string

       -Z     print zone ID

       -n name
	      process name to track

       -p PID PID to track

EXAMPLES

       Default output,
	      # rwsnoop

       Print zone ID,
	      # rwsnoop -.Monitor processes named "bash", # rwsnoop -n bash

FIELDS

       TIME   timestamp, us

       TIMESTR
	      time, string

       ZONE   zone ID

       PROJ   project ID

       UID    user ID

       PID    process ID

       PPID   parent process ID

       CMD    command name for the process

       D      direction, Read or Write

       BYTES  total bytes during sample

       FILE   filename,  if  file  based.  Reads and writes that are not file based, for example with sockets, will print "<unknown>" as the file-
	      name.

DOCUMENTATION

       See the DTraceToolkit for further documentation under the Docs directory. The DTraceToolkit docs may include full worked examples with ver-
       bose descriptions explaining the output.

EXIT

       rwsnoop will run forever until Ctrl-C is hit.

AUTHOR

       Brendan Gregg [Sydney, Australia]

SEE ALSO

       rwtop(1M), dtrace(1M)

version 0.70							   Jul 24, 2005 						       rwsnoop(1m)
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