Sponsored Content
Top Forums Shell Programming and Scripting Regarding command substitution Post 302896980 by Perderabo on Thursday 10th of April 2014 10:42:58 AM
Old 04-10-2014
I don't know sqlplus and therefore I don't know what effect you hope to achieve. I also don't understand your need to use use backquotes. But try doubling the backslash.

Code:
bash-3.1$
bash-3.1$ abc="kkjhkjhkjhkj"
bash-3.1$ echo ` echo a\b v\$abc`
ab vkkjhkjhkjhkj
bash-3.1$ echo $( echo a\b v\$abc)
ab v$abc
bash-3.1$ echo ` echo a\b v\\$abc`
ab v$abc
bash-3.1$
bash-3.1$

This User Gave Thanks to Perderabo For This Post:
 

10 More Discussions You Might Find Interesting

1. Shell Programming and Scripting

Substitution of last command

"Is there any substituation of last command or script syntax which can be used as a user. As far I know the "last" command is being used to display information about previous logins. A member of adm group or the user adm can execute it only. Thanks in advance for your usual help. Ghazi (6 Replies)
Discussion started by: ghazi
6 Replies

2. Shell Programming and Scripting

complex command substitution

hi, I have to execute this line below from within a shell script; simply backquoting it is not doing the trick; it is mangling up all the options; but when i type it out on a command line, it executes cleanly. Please help me in getting this right; $ vlc -I dummy --sout='#transcode{vcodec=mp4v,... (5 Replies)
Discussion started by: spopuri
5 Replies

3. Shell Programming and Scripting

Difference between "Command substitution" and "Process substitution"

Hi, What is the actual difference between these two? Why the following code works for process substitution and fails for command substitution? while IFS= read -r line; do echo $line; done < <(cat file)executes successfully and display the contents of the file But, while IFS='\n' read -r... (3 Replies)
Discussion started by: royalibrahim
3 Replies

4. UNIX for Dummies Questions & Answers

Command substitution within an echo

I'm trying to get this to work and I'm not really sure how to do it. echo $x | awk '{print $NF}' MODIFIEDThe output I'm trying to get should look like: dir1 MODIFIED Where dir1 will be the result of: $x |awk '{print $NF}'I'm sure there's something I'm supposed to put around that part... (3 Replies)
Discussion started by: ewoods
3 Replies

5. UNIX for Dummies Questions & Answers

sed insert command and variable expansion/command substitution

I know this script is crummy, but I was just messing around.. how do I get sed's insert command to allow variable expansion to show the filename? #!/bin/bash filename=`echo $0` /usr/bin/sed '/#include/ { i\ the filename is `$filename` }' $1 exit 0 (8 Replies)
Discussion started by: glev2005
8 Replies

6. UNIX for Dummies Questions & Answers

read command - using output from command substitution

Hey, guys! Trying to research this is such a pain since the read command itself is a common word. Try searching "unix OR linux read command examples" or using the command substitution keyword. :eek: So, I wanted to use a command statement similar to the following. This is kinda taken... (2 Replies)
Discussion started by: ProGrammar
2 Replies

7. Shell Programming and Scripting

Repeating Substitution Command on VI

Hello Folks, how to write a command on vi that allow to repeat last substitution command? Here what I want to do : 1 2 3 1 2 3 1 2 3 :.,+2s/\n/ /And I obtain : 1 2 3 1 2 3 1 (5 Replies)
Discussion started by: gogol_bordello
5 Replies

8. UNIX for Advanced & Expert Users

Help with command substitution in C program

Hi, I want to know if there's a cleaner way for assigning output of a unix command to a variable in C program . Example : I execute dirname fname and want the output to be assigned to a variable dname . Is it possible . I knew u can redirect the output to a file and then reread assigning... (5 Replies)
Discussion started by: royalbull
5 Replies

9. Shell Programming and Scripting

Command substitution in echo

a=1 b1=unix echo $b`$a` The above code is not working. Instead of printing the variable b1 using 'echo $b1', how to use variable 'a' to print 'b1' (1 Reply)
Discussion started by: thulasidharan2k
1 Replies

10. Shell Programming and Scripting

Substitution within string command

I have the following code: strfuture=abcdefghi ver=${strfuture:${count}:1} mj7777_ver=${ver} start_mj7777_iteration let count=count+1 When it is executed I get bad substitution. The same if I use ver=${strfuture:$count:1} mj7777_ver=${ver}... (6 Replies)
Discussion started by: Bruble
6 Replies
LIBBASH(7)							  libbash Manual							LIBBASH(7)

NAME
libbash -- A bash shared libraries package. DESCRIPTION
libbash is a package that enables bash dynamic-like shared libraries. Actually its a tool for managing bash scripts whose functions you may want to load and use in scripts of your own. It contains a 'dynamic loader' for the shared libraries ( ldbash(1)), a configuration tool (ldbashconfig(8)), and some libraries. Using ldbash(1) you are able to load loadable bash libraries, such as getopts(1) and hashstash(1). A bash shared library that can be loaded using ldbash(1) must answer 4 requirments: 1. It must be installed in $LIBBASH_PREFIX/lib/bash (default is /usr/lib/bash). 2. It must contain a line that begins with '#EXPORT='. That line will contain (after the '=') a list of functions that the library exports. I.e. all the function that will be usable after loading that library will be listed in that line. 3. It must contain a line that begins with '#REQUIRE='. That line will contain (after the '=') a list of bash libraries that are required for our library. I.e. every bash library that is in use in our bash library must be listed there. 4. The library must be listed (For more information, see ldbashconfig(8)). Basic guidelines for writing library of your own: 1. Be aware, that your library will be actually sourced. So, basically, it should contain (i.e define) only functions. 2. Try to declare all variables intended for internal use as local. 3. Global variables and functions that are intended for internal use (i.e are not defined in '#EXPORT=') should begin with: __<library_name>_ For example, internal function myfoosort of hashstash library should be named as __hashstash_myfoosort This helps to avoid conflicts in global name space when using libraries that come from different vendors. 4. See html manual for full version of this guide. AUTHORS
Hai Zaar <haizaar@haizaar.com> Gil Ran <ril@ran4.net> SEE ALSO
ldbash(1), ldbashconfig(8), getopts(1), hashstash(1) colors(1) messages(1) urlcoding(1) locks(1) Linux Epoch Linux
All times are GMT -4. The time now is 07:27 PM.
Unix & Linux Forums Content Copyright 1993-2022. All Rights Reserved.
Privacy Policy