Difference between if [[ ]] and if [ ] statements


Login or Register for Dates, Times and to Reply

 
Thread Tools Search this Thread
# 1  
Difference between if [[ ]] and if [ ] statements

Hi,

Can anyone Please tell me what is the difference between the following variation in the "if loops"

a. if [[ condition ]]
and
b. if [ condition ]

Thanks...
Rony
# 2  
In case of bash, this would help you
Login or Register for Dates, Times and to Reply

Previous Thread | Next Thread
Thread Tools Search this Thread
Search this Thread:
Advanced Search

Test Your Knowledge in Computers #815
Difficulty: Medium
In CSS, E[foo] matches an E element with a 'foo' class name.
True or False?

10 More Discussions You Might Find Interesting

1. Shell Programming and Scripting

awk to calculate difference of split and sum the difference

In the awk I am trying to subtract the difference $3-$2 of each matching $4 before the first _ (underscore) and print that value in $13. I think the awk will do that, but added comments. What I am not sure off is how to add a line or lines that will add sum each matching $13 value and put it in... (2 Replies)
Discussion started by: cmccabe
2 Replies

2. Programming

what is the main difference between difference between using nonatomic lseek and O_APPEND

I think both write at the end of the file ...... but is there a sharp difference between those 2 instruction ..... thank you this is my 3rd question today forgive me :D (1 Reply)
Discussion started by: fwrlfo
1 Replies

3. Shell Programming and Scripting

vi and if statements

Hi I am very new to Unix programming and shell scripting. I am trying t figure out how to write a little script that will output the number of directories. I can find the number of directories using ls -l | grep "^d" | wc -l I can not figure out how to do it so when I type the name... (8 Replies)
Discussion started by: Reddoug
8 Replies

4. Shell Programming and Scripting

Help with IF statements

I am writing a script that does a search for a argument in a file and lists all like occurrences. The script verifies that it is a file and then runs another script that list the lines. My problem is that I need the script to accept a file or a directory and then go to that directory check all... (1 Reply)
Discussion started by: zero3ree
1 Replies

5. Shell Programming and Scripting

If statements....

Good morning all! I want to know if Im interpreting this if statement below right. if(((1) || (0)) && (1)){ do stuff; } This is saying: if true piped into false, then true, then do stuff. Right? What does the && stand for? thanks in advance! ben (3 Replies)
Discussion started by: bigben1220
3 Replies

6. UNIX for Dummies Questions & Answers

Help with For Statements

Hi, I am trying to write a for statement that will allow for the ps, who, finger, and date commands to run. Can anyone help? I use Putty. (22 Replies)
Discussion started by: lexydoll87
22 Replies

7. Shell Programming and Scripting

HELP!! if statements

I am kind of new in Unix and i have to make a menu. I want to put an if statement in the menu. you should enter the filename and it goes to that file. How do i do this? (1 Reply)
Discussion started by: trob
1 Replies

8. Shell Programming and Scripting

Please help on IF statements.

I had different problem scenarios with IF statement. Can any expert please enlighten me on the difference with these scenarios. Thank you. 1st Scenario: testdate=`date +%Y%m` test=`cat /var/log/database0.$testdate*.log | grep "Errors found during processing" | tail -10` if then ... (4 Replies)
Discussion started by: filthymonk
4 Replies

9. Shell Programming and Scripting

or statements?

how do i do an or in an if-then statement? i tried: if ; then bleh fi how???? (1 Reply)
Discussion started by: Blip
1 Replies

10. UNIX for Dummies Questions & Answers

if statements

I am trying to change this : Albert Einstein 52 Peter Scott 22 Hilary Smith 48 Joan Bakewell 30 Catherine Maguire 26 into Albert Einstein Pass Peter Scott Fail Hilary Smith Pass Joan Bakewell Fail Catherine Maguire Fail I have to use a if statement that says: if field 3 is... (2 Replies)
Discussion started by: lilas
2 Replies

Featured Tech Videos