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Full Discussion: Perl find & replace - what am I doing wrong?
Top Forums UNIX for Dummies Questions & Answers Perl find & replace - what am I doing wrong? Post 302814617 by sudon't on Wednesday 29th of May 2013 09:00:23 PM
Old 05-29-2013
Quote:
To be honest, I dislike perl
Yes, you have mentioned this to me. ; ) Now, obviously you know more about it than I do, but in my defense let me just say that the little find/replace thing I learned, (or thought I had), appears simple to me:
Code:
perl -pi -e 's/read/write/g' /path/to/file

Much of the reason is that I see "one-liners" as quick and easy. And part of the reason is that it "works in place" rather than creating new files. Also, I like the notion of a perl pie!
But ok, I read your post on the -i flag. I'm not sure how much of that would come into play for me. After all, I'm a truck driver, not a sysadmin, and just playing on my personal computer. But I do understand and appreciate developing good practices, and you are correct to encourage that.
Ok, here are my questions:
How is the line being deleted? Is that what the d operator is saying, delete? And will it then delete any line which contains the preceding string? In other words, if we know that only our target line contains "PhotoBooth", would that be enough to get rid of the whole line?
Code:
'/PhotoBooth/d'

Why do certain characters have to be escaped? I thought if the regex is quoted, it's protected from the shell.
 

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LEARN ABOUT DEBIAN

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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