Split GST Command using Shell Script

Question

I'd like to split the following GST command into two halves using shell script.

/GstPipeline:pipeline0/GstUDPSink:udpsink0.GstPad:sink: caps = application/x-rtp, media=(string)video, clock-rate=(int)90000, encoding-name=(string)H264, sprop-parameter-sets=(string)\"Z0KAHukBQHpCAAAH0AAB1MAI\\,aM48gA\\=\\=\", payload=(int)96, ssrc=(uint)2416890621, clock-base=(uint)518578781, seqnum-base=(uint)24075

The split has to occur at caps = The two new lines should be stored in two variables $var1 and $var2

$var1 should contain /GstPipeline:pipeline0/GstUDPSink:udpsink0.GstPad:sink:

And $var2 should contain application/x-rtp, media=(string)video, clock-rate=(int)90000, encoding-name=(string)H264, sprop-parameter-sets=(string)\"Z0KAHukBQHpCAAAH0AAB1MAI\\,aM48gA\\=\\=\", payload=(int)96, ssrc=(uint)2416890621, clock-base=(uint)518578781, seqnum-base=(uint)24075

Remember there are two backslashes in the input string. So doing an echo will give only one backslash.

glenn jackman · Accepted Answer · 2013-02-10 12:19:00Z

1

Use shell parameter expansion:

$ cmd='/GstPipeline:pipeline0/GstUDPSink:udpsink0.GstPad:sink: caps = application/x-rtp, media=(string)video, clock-rate=(int)90000, encoding-name=(string)H264, sprop-parameter-sets=(string)\"Z0KAHukBQHpCAAAH0AAB1MAI\\,aM48gA\\=\\=\", payload=(int)96, ssrc=(uint)2416890621, clock-base=(uint)518578781, seqnum-base=(uint)24075'

$ first=${cmd% caps = *}; echo ">>$first<<"
>>/GstPipeline:pipeline0/GstUDPSink:udpsink0.GstPad:sink:<<

$ second=${cmd#* caps = }; echo ">>$second<<"
>>application/x-rtp, media=(string)video, clock-rate=(int)90000, encoding-name=(string)H264, sprop-parameter-sets=(string)\"Z0KAHukBQHpCAAAH0AAB1MAI\\,aM48gA\\=\\=\", payload=(int)96, ssrc=(uint)2416890621, clock-base=(uint)518578781, seqnum-base=(uint)24075<<

answered Feb 10, 2013 at 12:19

glenn jackman

249k42 gold badges233 silver badges362 bronze badges

Sign up to request clarification or add additional context in comments.

2 Comments

Maxtron Over a year ago

When I do an echo, it changes the two backslashes to one backslash. How do I fix this? echo -e also gives me a single backslash.

glenn jackman Over a year ago

make sure you use double quotes around the variable in the echo command. My output above was copy/pasted and the backslashes seem consistent.

kleopatra · Accepted Answer · 2013-02-10 12:15:12Z

1

a="/GstPipeline:pipeline0/GstUDPSink:udpsink0.GstPad:sink: caps = application/x-rtp, media=(string)video, clock-rate=(int)90000, encoding-name=(string)H264, sprop-parameter-sets=(string)\"Z0KAHukBQHpCAAAH0AAB1MAI\\,aM48gA\\=\\=\", payload=(int)96, ssrc=(uint)2416890621, clock-base=(uint)518578781, seqnum-base=(uint)24075"

You could cut strings by spaces.

var1=`echo $a | cut -d' ' -f1` 

$var1 = /GstPipeline:pipeline0/GstUDPSink:udpsink0.GstPad:sink:

var2=`echo $a | cut -d' ' -f4-` 

$var2 = application/x-rtp, media=(string)video, clock-rate=(int)90000, encoding-name=(string)H264, sprop-parameter-sets=(string)\"Z0KAHukBQHpCAAAH0AAB1MAI\\,aM48gA\\=\\=\", payload=(int)96, ssrc=(uint)2416890621, clock-base=(uint)518578781, seqnum-base=(uint)24075

edited Feb 10, 2013 at 12:15

kleopatra

51.6k28 gold badges103 silver badges220 bronze badges

answered Feb 10, 2013 at 11:55

Manish Kumar Sharma

111 bronze badge

1 Comment

Maxtron Over a year ago

When I do an echo, it changes the two backslashes to one backslash. How do I fix this? echo -e also gives me a single backslash.

Collectives™ on Stack Overflow

Split GST Command using Shell Script

2 Answers 2

2 Comments

1 Comment

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

2 Answers 2

2 Comments

1 Comment

Your Answer

Sign up or log in

Post as a guest

Related