[
and
[[
are both command but like
cp and mv are different, same situation between [ and [[.
test command (you can write it also [ ) has been already in Bourneshell. Testing command (I mean [[ ) has done later, maybe it was David Korn ?.
Ex. I'm so old sh user, I use always old test command (sometimes I write it using [ ).
I have never need to use [[ ]] testing. If test is not enough, I like more case pattern to use comparing strings. So read manual (bash or ksh) and try to see the light between [ and [[.
Hi All,
Hope you all are doing good. Yesterday in my project i came across a scenario which i can not guess why it was working in one region and why it was not in another region. Please find my issue below.
I am using AIX version 6.0 of UNIX in my project, in shell scripting i have the... (1 Reply)
Hello all,
I have the following problem:
$ cat infile
this is spam and i need this too
this is spam and i need this too
$ perl -nwe '$_ =~ /]+ \]+)\]\]*\]? (\+)$/; print "$1 - $2\n";' infile
i need this - too
i need this - and i need this too
I am not sure how many occurences of... (13 Replies)
I wanted to store the number inside the square bracket between colon( : ) and closing suqre bracket(]) in some variable.
Suppose I have lines like :
Input file :
20140320 00:08:23.846 INFO 84] - anything in line
20140320 00:08:23.846 Test 589] - Virtual and lab lab anything... (18 Replies)
Hi frieds, I don't understand the difference between single square bracket and double square brackets in a IF condition.
Ex.
if ;
then
RETURNJOB=1
else
RETURNJOB=0
fi
It run, but this
if ];
then
RETURNJOB=1
else
RETURNJOB=0
fi (4 Replies)
Hi All,
I have a text file which looks like this:
computer programming
systems engineering
I want to get rid of these square brackets and also the text that is inside these brackets. So that my final text file looks like this:
computer programming
systems engineering
I am using... (3 Replies)
hi guys,
i'm writing a script that looks for a unquie id in a file and replaces a string between two square brackets on the same line as the unquie id:
.......
.......
0001 zz 43242 replace this text] name
0002 sd 65466 UK] country
.......
.......
how can i find line with id 0001... (6 Replies)
Hi,
I just came across an interesting shell script syntax like the one below:
] && (trap 'rm -rf ${WORK_DIR}/*.$$; echo "\n\nInterrupted !!\n\n"; exit 4' 1 2 3 15)
Can someone please explain the code snippet above?
The trap command bit is fine but ] && is the hazy part.
Generally we use an... (2 Replies)
One of the senior administrators gave me a shell script to modify and it begins as follows:
if ] && ]
{more code follows}
Why the double square brackets? (10 Replies)