10 More Discussions You Might Find Interesting
1. Shell Programming and Scripting
Hi all,
I thought this would be simple, but I've been having a lot of trouble trying to write this IF statement, if I may ask for help pls:
In BASH, how would I construct the if statement:
Should ONLY be true if USEROPTscript=="yes"]] AND $mode=="INSTALL" /or/ $mode=="CHANGE" ]]... (3 Replies)
Discussion started by: jmccoughlin
3 Replies
2. Shell Programming and Scripting
Hi,
I don't understand && and || in this context. I thought && is for logical 'AND' and || is for logical 'OR'.
&& echo "Not empty" || echo "Empty"
Please help
Thank You (5 Replies)
Discussion started by: TomG
5 Replies
3. Shell Programming and Scripting
Hi everybody!!
Here is the thing; I have a trouble in this simple situation, I'm trying to write an array with all the arguments of a command. I mean, if I have:
./mycommand.sh aa bb cc dd
I need to take an array like this:
myarray=(aa bb cc dd)
So I use a simple for loop like this:
for... (4 Replies)
Discussion started by: andresgom
4 Replies
4. Shell Programming and Scripting
Hi,
I need to construct the below path from the two available directory path,
O/P
/home/data/test/run/ht/WEB/HTML
/home/data/test/run/ht/WEB/JSP
/home/data/test/run/ht/WEB/CSS
Path:1
------
/home/data/test/run/
Path:2
------
/home/data/share/app/01/lang/ht/WEB/HTML... (5 Replies)
Discussion started by: vel4ever
5 Replies
5. UNIX for Dummies Questions & Answers
Please help me out: I've seen this construct
awk '{...}1'several times, like in scrutinizer's today's post
awk '{for(i=2;i<=NF;i++)if($i==$1)$i=RS $i}1' infilebut I can't find (manuals, man pages, internet FAQs,...) an explanation of what it does resp. stands for. Any hint is appreciated! (5 Replies)
Discussion started by: RudiC
5 Replies
6. Shell Programming and Scripting
I'd like to create a variable with the value of X number of space( no Perl please), printf seems to work, but , in following example,10 spaces becomes 1 space when assinged to a variable, Why? other solutions are welcome.
$printf "=%10s=\n"
= =
$var=$(printf "=%10s=\n")
echo... (4 Replies)
Discussion started by: honglus
4 Replies
7. Shell Programming and Scripting
Hi
can anyone tell me why is this code giving error
mode=$1
if ] || ] then
echo "MODES:"
exit 1
fi
Thanks (5 Replies)
Discussion started by: Anteus
5 Replies
8. Shell Programming and Scripting
Hi all,
Sorry to ask this easy question but I am stuck. In a scenario i am executing one shell script which contains a if - else construct :
if ; then
echo $line
$line >> successful_build.txt
else
$line >> failed_services.txt
fi
explaination : if the... (5 Replies)
Discussion started by: bhaskar_m
5 Replies
9. Shell Programming and Scripting
Hi Guys,
could someone tell me what this ksh construct does
typeset -r PROG_PWD=${0%/*} does
I understand the -r for readonly but I would very much appreciate a definitive account of what this will set $PROG_PWD to.
If I run this at the cmd line it it gets set to /usr/bin but I would... (2 Replies)
Discussion started by: ajcannon
2 Replies
10. Shell Programming and Scripting
Hi all
I have tried to search for this, but keep getting a MySQL db connect error, so am posing the question here, and taking a risk of incurring the wrath of the mods with my first post...
I have the following test script:
#!/bin/bash
HTTPD=`/bin/ps -axcu | /usr/bin/grep httpd... (6 Replies)
Discussion started by: mikie
6 Replies
GETOPT(1) BSD General Commands Manual GETOPT(1)
NAME
getopt -- parse command options
SYNOPSIS
args=`getopt optstring $*`
set -- `getopt optstring $*`
DESCRIPTION
getopt is used to break up options in command lines for easy parsing by shell procedures, and to check for legal options. [Optstring] is a
string of recognized option letters (see getopt(3)); if a letter is followed by a colon, the option is expected to have an argument which may
or may not be separated from it by white space. The special option ``--'' is used to delimit the end of the options. getopt will place
``--'' in the arguments at the end of the options, or recognize it if used explicitly. The shell arguments ($1, $2, ...) are reset so that
each option is preceded by a ``-'' and in its own shell argument; each option argument is also in its own shell argument.
getopt should not be used in new scripts; use the shell builtin getopts instead.
EXAMPLES
The following code fragment shows how one might process the arguments for a command that can take the options [a] and [b], and the option
[c], which requires an argument.
args=`getopt abc: $*`
if [ $? -ne 0 ]; then
echo 'Usage: ...'
exit 2
fi
set -- $args
while [ $# -gt 0 ]; do
case "$1" in
-a|-b)
flag=$1
;;
-c)
carg=$2; shift
;;
--)
shift; break
;;
esac
shift
done
This code will accept any of the following as equivalent:
cmd -acarg file file
cmd -a -c arg file file
cmd -carg -a file file
cmd -a -carg -- file file
IEEE Std 1003.2 (``POSIX.2'') mandates that the sh(1) set command return the value of 0 for the exit status. Therefore, the exit status of
the getopt command is lost when getopt and the sh(1) set command are used on the same line. The example given is one way to detect errors
found by getopt.
DIAGNOSTICS
getopt prints an error message on the standard error output when it encounters an option letter not included in [optstring].
SEE ALSO
sh(1), getopt(3)
HISTORY
Written by Henry Spencer, working from a Bell Labs manual page. Behavior believed identical to the Bell version.
BUGS
Whatever getopt(3) has.
Arguments containing white space or embedded shell metacharacters generally will not survive intact; this looks easy to fix but isn't.
The error message for an invalid option is identified as coming from getopt rather than from the shell procedure containing the invocation of
getopt; this again is hard to fix.
The precise best way to use the set command to set the arguments without disrupting the value(s) of shell options varies from one shell ver-
sion to another.
BSD
November 28, 2009 BSD
