Sponsored Content
Top Forums Shell Programming and Scripting ksh: what does x in front of something mean? Post 302466538 by ctsgnb on Tuesday 26th of October 2010 04:09:41 PM
Old 10-26-2010
remove the x , make a test with an empty ip and see what happen ...



---------- Post updated at 10:09 PM ---------- Previous update was at 10:07 PM ----------




if $ip is empty :
Code:
[[ x$ip = x127.0.0.1 ]]
[[ x = x127.0.0.1 ]] ===> false

now if $ip is empty without x :
Code:
[[ $ip = 127.0.0.1 ]]
[[  = 127.0.0.1 ]] ===> Error

Note that this would not happen using double quote
Code:
[[ "$ip" = "127.0.0.1" ]]
[[ "" = "127.0.0.1" ]] ===> false

Ok course these behaviours may depends on your system OS and SHELL implementation, but this is what "could" be expected

Last edited by ctsgnb; 10-26-2010 at 05:17 PM..
This User Gave Thanks to ctsgnb For This Post:
 

6 More Discussions You Might Find Interesting

1. UNIX for Advanced & Expert Users

Front end on Unix

Hi, I would like to develop a user interface on Solaris. Can anybody throw some light on currently available software utilities/ packages..? Thanks in Advance .. JS (4 Replies)
Discussion started by: shibz
4 Replies

2. Shell Programming and Scripting

sh, ksh: command to remove front spaces from a string?

dear pro-coders, is there any command out there that takes out the front spaces from a string? sample strings: 4 members 5 members 3 members but it has to be like so: 4 members 5 members 3 members (3 Replies)
Discussion started by: pseudocoder
3 Replies

3. Shell Programming and Scripting

Appending the last few columns to the front

Hi consider this as the first line 00010015 MORGAN STANLEY & CO INCORPORATED N 110 INVESTAR 1 0001OT NJ 201-830-5055 01-Jan-1974 00:00:00 1 01-May-2008 00:00:00 05-Jun-2008 13:34:18 0001 - From SMSRun1_GIDQA02 Consider this as the second line 00010015 MORGAN STANLEY... (3 Replies)
Discussion started by: ragavhere
3 Replies

4. Shell Programming and Scripting

ksh - adding a dynamic value to the front of a line

Hi Forum, Im trying to write some code to read a file, take a certain dynamic value and write it back to the file at the front of every line. For example, file.txt is: SIMPLE=HELLO CONFIDENTIAL=false SENDER=false REQUIRED=true FEEDBACK=false UPDATE=false REQUIRED=false MAPPING=true... (9 Replies)
Discussion started by: ocelot
9 Replies

5. Shell Programming and Scripting

Terminal to the front no matter what

Is there a way to bring the terminal script to the front? I am running this script through OMCEdit which is then running it through Terminal. I have some dialog boxes (using osascript) and the dialog boxes are not coming to the front...Terminal bounces and I have to click on Terminal to see the... (1 Reply)
Discussion started by: mainegate
1 Replies

6. Linux

How to add \ in front of $ in a script with vi?

Please help to provide command in vi to add \ in front of $ so it does not interpret next character. rm interfaces/DART/WEB-INF/classes/DART/util/TotalDisconnectUtil$1.class rm interfaces/DART/WEB-INF/classes/DART/util/TotalDisconnectUtil$2.class rm... (3 Replies)
Discussion started by: ywu081006
3 Replies
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)
All times are GMT -4. The time now is 02:34 AM.
Unix & Linux Forums Content Copyright 1993-2022. All Rights Reserved.
Privacy Policy