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Full Discussion: Grep Data Base on Header
Top Forums Shell Programming and Scripting Grep Data Base on Header Post 302967720 by Don Cragun on Friday 26th of February 2016 09:26:33 PM
Old 02-26-2016
You weren't far off. Your field separator is a comma, not a comma followed by a space. So, if you change your first sed from:
Code:
sed '1!d;s/, /\n/g' $A

to:
Code:
sed '1!d;s/,/\n/g' $A

as in:
Code:
#!/bin/ksh
A=A.txt
B=B.txt
cols=($(sed '1!d;s/,/\n/g' "$A" | grep -nf "$B" | sed 's/:.*$//'))
cut -d ',' -f 1$(printf ",%s" "${cols[@]}") "$A"

it seems to do what you want. You might also want to consider:
Code:
#!/bin/ksh
A='A.txt'
B='B.txt'
awk '
BEGIN {	FS = OFS = ","
}
FNR == NR {
	h[++hc] = $0
	next
}
FNR == 1 {
	for(i = 1; i <= hc; i++) {
		for(j = 1; j <= NF; j++) {
			if($j == h[i]) {
				o[i] = j
				break
			}
		}
		if(j > NF) {
			printf("Header \"%s\" not found in file \"%s\".\n",
			    h[i], FILENAME)
			exit 1
		}
	}
}
{	for(i = 1; i <= hc; i++)
		printf("%s%s", $o[i], (i == hc) ? ORS : OFS)
}' "$B" "$A"

which invokes awk once instead of invoking sed twice, grep once, and cut once; so it should run a bit faster.

As always, if you want to try this on a Solaris/SunOS system, change awk to /usr/xpg4/bin/awk or nawk.
 

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LEARN ABOUT LINUX

irsend

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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