09-27-2004
Most programming lanugages allow for brackets or parentheses for clarification purposes...
But they are usu not required by many languages. Be careful when using parenthesis too often, as you might become confused and have an odd one which will cause much hairpulling on your part to debug.
Many "shell" languages dont use braces or parenthesis, they use the logic structure to open and close logic statements...
if
fi
case
esac
if
then
elseif
fi
fi
10 More Discussions You Might Find Interesting
1. UNIX for Dummies Questions & Answers
I would like to substitute a phrase which contains square brackets.
change TO
how?
Thanks (2 Replies)
Discussion started by: gilead29
2 Replies
2. UNIX for Dummies Questions & Answers
Hi,
I would like to know about the usage of brackets to negate a set of boolean evaluations
an equivalent to what i am trying is below
if or || ] ]
then
echo"valid time of day"
else
echo "invalid input"
exit
fi
the bracket structue as mentioned doesnt work .. i am using ksh.... (4 Replies)
Discussion started by: lakshmikanth
4 Replies
3. UNIX for Dummies Questions & Answers
Hello guys, I'm brand new to UNIX. I've installed Cygwin as recommended, but here are some problems. Well, man command doesn't work and I also don't know how to create a file or even how to type (). With () the program gives me an error message. Please tell me how to do all these things. Best... (4 Replies)
Discussion started by: wadem
4 Replies
4. Shell Programming and Scripting
Hi
I am having hard time getting this right and need some help. I Have several log files, and everyone contains the following 3 lines at the end:
4 ETW000 Disconnected from database.
4 ETW000 End of Transport (0000).
4 ETW000 date&time: 13.01.2011 - 08:03:28
I need to capture the value... (7 Replies)
Discussion started by: nimo
7 Replies
5. Shell Programming and Scripting
Hello,
I am trying to write a script using ksh. And I want to get the value within the first brackets of a string. For example:
14/04/11 11:35: 00 This is (nn) from the earth.
Then i hope to get nn in this case.
Can any one advise me how to implement it?
Thank you very much!
nn (2 Replies)
Discussion started by: n_n
2 Replies
6. Shell Programming and Scripting
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)
Discussion started by: shoaibjameel123
3 Replies
7. Shell Programming and Scripting
Hi all,
I've written a Perl script below that check and report for malformed braces. I have a UNIX ksh version and it took a couple of minutes to run on a 10000+ lines. With the Perl version it only took about 20 seconds so that is enough incentive for me to go Perl not to mention that I need... (1 Reply)
Discussion started by: newbie_01
1 Replies
8. Shell Programming and Scripting
Hi all. i need a small help.
i have written an exit code, which will check whether mo.sh is successful or not. if the status is >0 it will exit the shell.
1>Do you guys think it is a correct way to write?
2>what if i change the double bracket to single. how will it change the o/p.
... (1 Reply)
Discussion started by: sub
1 Replies
9. Shell Programming and Scripting
Hi
I am having hard time getting this right and need some help. I Have 3 files, and everyone contains the following:-
File1
Today, we have Name(Jack) Age(19) Class (A2)
Today, we have Name(Kim) Class (G9)
File2
Today, we have Name(Lee) Age(19) Class (A2)
Today, we have... (8 Replies)
Discussion started by: samsan
8 Replies
10. Shell Programming and Scripting
Is this a bash or wget issue?
GNU bash, version 4.4.0(1)-release (x86_64-slackware-linux-gnu)
GNU Wget 1.18 built on linux-gnu.
If I run wget -O file localhost/{2..4} from the command line, it will download pages 2 to 4 and concatenate them to file - which is what I want.
If I put this in a... (4 Replies)
Discussion started by: Ray-V
4 Replies
DDB(8) BSD System Manager's Manual DDB(8)
NAME
ddb -- configure DDB kernel debugger properties
SYNOPSIS
ddb capture [-M -core] [-N -system] print
ddb capture [-M -core] [-N -system] status
ddb script scriptname
ddb script scriptname=script
ddb scripts
ddb unscript scriptname
ddb pathname
DESCRIPTION
The ddb utility configures certain aspects of the ddb(4) kernel debugger from user space that are not configured at compile-time or easily
via sysctl(8) MIB entries.
To ease configuration, commands can be put in a file which is processed using ddb as shown in the last synopsis line. An absolute pathname
must be used. The file will be read line by line and applied as arguments to the ddb utility. Whitespace at the beginning of lines will be
ignored as will lines where the first non-whitespace character is '#'.
OUTPUT CAPTURE
The ddb utility can be used to extract the contents of the ddb(4) output capture buffer of the current live kernel, or from the crash dump of
a kernel on disk. The following debugger commands are available from the command line:
capture [-M core] [-N system] print
Print the current contents of the ddb(4) output capture buffer.
capture [-M core] [-N system] status
Print the current status of the ddb(4) output capture buffer.
SCRIPTING
The ddb utility can be used to configure aspects of ddb(4) scripting from user space; scripting support is described in more detail in
ddb(4). Each of the debugger commands is available from the command line:
script scriptname
Print the script named scriptname.
script scriptname=script
Define a script named scriptname. As many scripts contain characters interpreted in special ways by the shell, it is advisable to
enclose script in quotes.
scripts
List currently defined scripts.
unscript scriptname
Delete the script named scriptname.
EXIT STATUS
The ddb utility exits 0 on success, and >0 if an error occurs.
EXAMPLES
The following example defines a script that will execute when the kernel debugger is entered as a result of a break signal:
ddb script kdb.enter.break="show pcpu; bt"
The following example will delete the script:
ddb unscript kdb.enter.break
For further examples, see the ddb(4) and textdump(4) manual pages.
SEE ALSO
ddb(4), textdump(4), sysctl(8)
HISTORY
The ddb utility first appeared in FreeBSD 7.1.
AUTHORS
Robert N M Watson
BUGS
Ideally, ddb would not exist, as all pertinent aspects of ddb(4) could be configured directly via sysctl(8).
BSD
December 24, 2008 BSD