Linked Questions

5
votes
3answers
1k views

What is the difference having double quotes or not in bash [duplicate]

I have some bash scripts, one which has the following content: #!/bin/bash source $(dirname ${BASH_SOURCE[0]})/script.sh while the other one has the following content: #!/bin/bash source ...
1
vote
1answer
2k views

when to use double quotes with a variable in shell script? [duplicate]

I am in a confusion with what is meant by the double quotes referring to a variable. For example following two scripts gives the same output. What is really meant by the double quotes? Script1 ...
4
votes
1answer
165 views

Any problem assigning one variable to another in shell without using quotes? [duplicate]

This question is about assigning the entire contents of one variable to another variable. Variable is not being used (sent to echo, etc.) No parameter expansion is being done during the assignment. ...
1
vote
1answer
644 views

What is the difference between $var and “$var”? [duplicate]

Possible Duplicate: $VAR vs ${VAR} and to quote or not to quote I assigned a variable var a value as follows: pradeep@pradeep-laptop:~$ var="Pradeep > is > a good > boy" ...
1
vote
1answer
120 views

what is diffrence between “$var” and “${var}” [duplicate]

i have seen in many script usage of "$var" and "${var}", so I just want to know diffrence between "$var" and "${var}"
28
votes
3answers
10k views

Quoting within $(command substitution) in Bash

In my Bash environment I use variables containing spaces, and I use these variables within command substitution. Unfortunately I cannot find the answer on SE. What is the correct way to quote my ...
10
votes
3answers
38k views

How can I concatenate a shell variable to other other parameters in my command lines?

How can I concatenate a shell variable to other other parameters in my command lines ? For example, #!/bin/sh WEBSITE="danydiop" /usr/bin/mysqldump --opt -u root --ppassword $WEBSITE > ...
8
votes
7answers
5k views

Splitting large directory tree into specified-size chunks?

I have a directory tree that I would like to back up to optical disks. Unfortunately, it exceeds the size of any one disk (it's about 60GB). I am looking for a script that would split this tree into ...
5
votes
3answers
4k views

Why the double quotes and backquotes in a shell script?

I'm looking at this script mysql backup script and I don't understand what is the reason for using both backticks and double quotes around command names? 379 WHICH="`which which`" 380 AWK="`${WHICH} ...
1
vote
2answers
5k views

Creating an empty file having a variable name in a script

I need to create an empty file using a shell script. The filename will be determined by examining all the files in a directory matching a pattern, say TEST.*, and appending _END to it so that the new ...
5
votes
3answers
1k views

Quote a variable in shell script “if” statement

e.g. if [ "$FOO" = "true" ]; then vs if [ $FOO = "true" ]; then What is the different? Seems both of two statements also works.
1
vote
2answers
1k views

$(tail) into variable removing \n

I am doing the following: x="Hello to the world of tomorrow\n <pre>"; x="${x}$(tail -n 50 log/logfile.log)" x="${x}</pre>"; echo -e $x | ./perlscript The Perl script: #!perl # ...
5
votes
2answers
365 views

Bash, curious about echo $variable

I was hacking at a small script earlier and noticed something I can't explain. Running this command (time wget --spider http://www.google.co.uk/) 2>&1 | egrep 'real|response' gives me ...
-1
votes
1answer
3k views

How to move file from one folder to another in shell script by changing the permission

I want to move a file from one folder to another folder. When the file's format is with space in between (file _name.dat) and when I am using the command mv file _name.dat /tmp then the file is not ...

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