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Top Forums Shell Programming and Scripting Selecting one file from a list Post 302239502 by rubin on Tuesday 23rd of September 2008 11:27:59 PM
Old 09-24-2008
Quote:
Originally Posted by Legend986
Thanks a lot... Could you be kind enough to explain what exactly that is doing? I'm new to awk so any input is appreciated... From what I am assuming, it is basically storing names as keys and then taking care that there are no duplicate keys... is it? But still it seems a little surprising to me that it works...
Code:
awk -F. '!a[$2]++'

-F. - set field separator to a dot.
a[$2]++ - It's simply a counter, which is raised every time the same record is seen, and the field 2 of the filename is the key of the array a.
Code:
![a$2]++

It's the same as writing:

Code:
 { a[$2]=a[$2]+1
               if ( a[$2]==1 ) print $0 }

or

Code:
 a[$2]++==0 { print $0 }

This condition is true only when the record is seen the first time.
By the same token if you need the second occurrence of the same filename, then the condition would have been:
Code:
a[$2]++==1 { print $0 }

for third :
Code:
a[$2]++==2 { print $0 }

... and so on

Code:
xargs -i cp -p  '{}' /path/to/other_dir

On the list of files filtered by awk, execute the copy command on each file individually.
 

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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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