How to Force command substitution evaluation in bash? Post: 302969884

9 More Discussions You Might Find Interesting

1. Shell Programming and Scripting

How do I perform double substitution in bash?

#!/bin/bash #set -x MAX=255 FILE=$1.dns_list #declare -a d_arr if then echo "Usage: `basename $0` network" echo " e.g.`basename $0` 1.1.1" exit fi echo "Remove file $FILE..." rm $FILE for (( i = 1; i < $MAX; i++ )) do PARSE=$(host $1.${i}) ...

2. Shell Programming and Scripting

/bin/bash - variable substitution.

Is it possible with a bash variable to perform multiple substitution strings to one variable? I have this variable: echo $clock TIMEZONE="US/Central" What I would like to do with bash only it pull out just the "US" part of the variable.. which could be any number of countries. this is...

3. Shell Programming and Scripting

[bash] command line substitution with environmental variables

Hi, I'm using an array that contains compiler FLAGS that need to be executed either before ./configure or after the main 'make' command. example of array containing compiler flags. ------------------------------------------------- FLAGS="CFLAGS=\"-arch x86_64 -g -Os -pipe...

4. Shell Programming and Scripting

Correct bash substitution

Hello! I'm writing a shell script using #!/bin/bash instead of #!/bin/sh because of the substitution: ${!variable}, which won't work with sh. My main problem is the following (just a summarized example, the script is much more complex): # sourced from a configuration file, we have a lot of...

5. UNIX for Dummies Questions & Answers

cp command evaluation

Hi all! I'm writting one script to copy a file in various folders, but there are 2 things to validate. First that the folder where i'll be cpying exists, and second that i have permissions to copy the file in it. so far i have found the way to validate the folder exists, but when trying to...

6. Shell Programming and Scripting

bash, command line substitution

I have one script calling another with a set of strings that includes white space. Script A calls Script B with these input strings: one two "th ree" Script B pulls apart the arguments correctly: arg0 = one, arg1 = two, arg2 = "th ree" if I call it from within Script A like so:...

7. Shell Programming and Scripting

Bash regex evaluation not workin

I'm building a script that may received start and end date as parameters. I whant to make it as flexible as possible so I'm accepting epoch and date in a way that "date --date=" command may accept. In order to know if parameter provided is an epoc or a "date --date=" string I evaluate if the value...

8. Shell Programming and Scripting