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Full Discussion: awk to replace values in one file using a second reference file
Top Forums UNIX for Dummies Questions & Answers awk to replace values in one file using a second reference file Post 302971526 by aberg on Thursday 21st of April 2016 10:59:01 AM
Old 04-21-2016
awk to replace values in one file using a second reference file
Hi,

I'd be grateful for your help with the following:

I have a file with a single column (file1). Let's say the values are:

Code:
a
b
c
5
d

I have a second, reference file (ref_file), which is colon-delimited, and is effectively a key. Let's say the values in it are:

Code:
a:1
b:2
c:3
d:4
etc.

I want to use an awk command to scan through file 1, and replace the values with the elements in the reference file, so that the output will be:

Code:
1
2
3
5
4

(I want values that are already in the correct format in file 1 to be left alone - the '5' in this case).

The script I have tried is:

Code:
awk -F: 'FNR==NR{a[$1]=$2;next} {for (i in a)sub(i, a[i]);print}' ref_file file1

This doesn't work for some reason, and I don't know why. When I tried the script on a much shortened version of file1, the error message that I get is: awk: can't open file file1.

Any help/suggestions would be much appreciated.
Many thanks.
Last edited by jim mcnamara; 04-21-2016 at 12:02 PM.. Reason: code tags
 

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LEARN ABOUT SUSE

irsend

IRSEND(1)								FSF								 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 0.8.7pre1						     May 2010								 IRSEND(1)
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