Login or Register to Ask a Question and Join Our Community

Sponsored Content
Full Discussion: Partial variable substitution in script
Top Forums Shell Programming and Scripting Partial variable substitution in script Post 302930302 by Scrutinizer on Friday 2nd of January 2015 04:26:34 AM
Old 01-02-2015
Try:
Code:
touch "/usr/src/${var}_newfile_with_var.txt"

Otherwise the script will be trying to expand the non-existing variable $var_newfile_with_var. An underscore can be used as part of a variable name.

--edit--
In the case of
Code:
touch /usr/src/$1_newfile.txt

The braces are not strictly required, because $1 will be interpreted as a positional parameter no matter what follows (also - and perhaps because of this - variable names may not begin with a number).

But it will not hurt to use braces for clarity:
Code:
touch "/usr/src/${1}_newfile.txt"

Last edited by Scrutinizer; 01-02-2015 at 06:02 AM..
This User Gave Thanks to Scrutinizer For This Post:
anil510
 

10 More Discussions You Might Find Interesting

1. UNIX for Advanced & Expert Users

Substitution in a variable

Hey All, I'm trying to clean up a variable using sed but It dosn't seem to work. I'm trying to find all the spaces and replace them with "\ " (a slash and a space). For Example "Hello World" should become "Hello\ World". But it does nothing. If I put it directly into the command line it works... (3 Replies)
Discussion started by: spragueg
3 Replies

2. UNIX for Dummies Questions & Answers

variable substitution

Hi everyone, I have a simple question to ask : In a script that I'm writting, I need to create variables on-the-fly. For instance, for every iterartion of the following loop a var_X variable should be generated : #!/bin/ksh a="1 2 3" for i in $a do var_${i}=$i echo "${var_$i}" done ... (1 Reply)
Discussion started by: ck-18
1 Replies

3. Shell Programming and Scripting

Sed variable substitution when variable constructed of a directory path

Hello, i have another sed question.. I'm trying to do variable substition with sed and i'm running into a problem. my var1 is a string constructed like this: filename1 filerev1 filepath1 my var2 is another string constructed like this: filename2 filerev2 filepath2 when i do... (2 Replies)
Discussion started by: alrinno
2 Replies

4. Shell Programming and Scripting

Variable Substitution

Hi , I have a variable as follows, Temp=`cat ABC.txt | cut -c5-` This will yeild a part of the date. say , 200912. I would like to substitute this variable's value in a filename. eg: File200912F.zip when i say File$TempF.zip , it is not substituting. Any help ? Thanks in... (2 Replies)
Discussion started by: mohanpadamata
2 Replies

5. Shell Programming and Scripting

Making script show command (e.g. copy) being executed and variable substitution?

When script is running you only see when some of the commands are not successfull. Is there a way to see which command are executed and to show the substitution of variables as every line is executed ? (3 Replies)
Discussion started by: gr0124
3 Replies

6. Shell Programming and Scripting

How to use variable with command substitution in variable

For example I have variable like below echo $OUTPUT /some/path/`uname -n` when I try to use the variable OUTPUT like below cd $OUTPUT or cd ${OUTPUT} I am getting bad substituion error message $ cd $OUTPUT ksh: cd: bad substitution $ cd ${OUTPUT} ksh: cd: bad substitution ... (1 Reply)
Discussion started by: rajukv
1 Replies

7. Shell Programming and Scripting

AWK - Print partial line/partial field

Hello, this is probably a simple request but I've been toying with it for a while. I have a large list of devices and commands that were run with a script, now I have lines such as: a-router-hostname-C#show ver I want to print everything up to (and excluding) the # and everything after it... (3 Replies)
Discussion started by: ippy98
3 Replies

8. Shell Programming and Scripting

awk syntax(partial) in variable

if a variable has part of awk syntax stored in it. for eg: x=if($1>100) can we substitute this variable in an awk statement. based on above requirement can we execute something like: awk '{x print $1}' infile (5 Replies)
Discussion started by: 47shailesh
5 Replies

9. Shell Programming and Scripting

sed variable substitution in a script

Hi I am trying to do the following in a script find a string and add in a block of text two lines above on the command line this works fine #/usr/bin/cat /usr/local/etc/dhcpd.conf_subnet | /usr/xpg4/bin/sed -n -e '1h;1\!H;${;g;s/}.*#END of 10.42.33.0/#START of RANGE $dstart\:option... (3 Replies)
Discussion started by: eeisken
3 Replies

10. Shell Programming and Scripting

Bash script having variable substitution problems

Hi I am setting the variables like this : setenv MODULE1 modem5__3 setenv MODULE2 modem5__2 setenv MODULE3 modem_ctrl_1_1 setenv MODULE4 modem_1_0 setenv COUNT 10 I am having a bash script as shown below ################################################ #!/bin/bash for ((... (5 Replies)
Discussion started by: kshitij
5 Replies

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)
All times are GMT -4. The time now is 04:47 PM.
Unix & Linux Forums Content Copyright 1993-2022. All Rights Reserved.
Privacy Policy