9 More Discussions You Might Find Interesting
1. UNIX for Dummies Questions & Answers
How to use "mailx" command to do e-mail reading the input file containing email address, where column 1 has name and column 2 containing “To” e-mail address
and column 3 contains “cc” e-mail address to include with same email.
Sample input file, email.txt
Below is an sample code where... (2 Replies)
Discussion started by: asjaiswal
2 Replies
2. Shell Programming and Scripting
I want to print any matching IP addresse in List1 with List 2;
List 1
List of IP addresses;
161.85.58.210
250.57.15.129
217.23.162.249
74.76.129.101
30.221.177.237
3.147.200.59
170.58.142.64
127.65.109.33
150.167.242.146
223.3.20.186
25.181.180.99
2.55.199.32 (3 Replies)
Discussion started by: lewk
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3. Shell Programming and Scripting
Hello everyone
Sorry I have to add another sed question. I am searching a log file and need only the first 2 occurances of text which comes after (note the space) "string " and before a ",". I have tried
sed -n 's/.*string \(*\),.*/\1/p' filewith some, but limited success. This gives out all... (10 Replies)
Discussion started by: haggismn
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4. Shell Programming and Scripting
Hi,
Could anyone please shed some light on the following script lines and what is it doing as it was written by an ex-administrator?
cat $AMS/version|read a b verno d
DBVer=$(/usr/bin/printf "%7s" $verno)
I checked that the cat $AMS/version command returns following output:
... (10 Replies)
Discussion started by: dbadmin100
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5. Shell Programming and Scripting
Hi!!..
I would like to know what is maximum character size for a command in the "sh" or "bourne" shell?
Thanks in advance..
Roshan. (1 Reply)
Discussion started by: Roshan1286
1 Replies
6. UNIX for Advanced & Expert Users
Hi!!..
I would like to know what is maximum character size for a command in the "sh" or "bourne" shell?
Thanks in advance..
Roshan. (1 Reply)
Discussion started by: Roshan1286
1 Replies
7. UNIX for Dummies Questions & Answers
Hi!!..
I would like to know what is maximum character size for a command in the "sh" or "bourne" shell?
Thanks in advance..
Roshan. (1 Reply)
Discussion started by: Roshan1286
1 Replies
8. Shell Programming and Scripting
Hallo,
i need a Prompting read in my script:
read -p "Enter your command: " command
But i always get this Error:
-p: is not an identifier
When I run these in c-shell i get this error
/usr/bin/read: read: bad option(s)
How can I use a Prompt in the read command? (9 Replies)
Discussion started by: wiseguy
9 Replies
9. Shell Programming and Scripting
Dears,
I've written a script which allows me to send mails in different formats with different attaches. Now I still want to add a feature to this script. My users would like to be able to receive a "read" or "delivered" receipt for their mails.
The script send mails on behalve of an specific... (1 Reply)
Discussion started by: plelie2
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GETOPT(1) BSD General Commands Manual GETOPT(1)
NAME
getopt -- parse command options
SYNOPSIS
args=`getopt optstring $*` ; errcode=$?; set -- $args
DESCRIPTION
The getopt utility 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. The
getopt utility 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 argu-
ment.
EXIT STATUS
The getopt utility prints an error message on the standard error output and exits with status > 0 when it encounters an option letter not
included in optstring.
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 -o,
which requires an argument.
args=`getopt abo: $*`
# you should not use `getopt abo: "$@"` since that would parse
# the arguments differently from what the set command below does.
if [ $? -ne 0 ]; then
echo 'Usage: ...'
exit 2
fi
set -- $args
# You cannot use the set command with a backquoted getopt directly,
# since the exit code from getopt would be shadowed by those of set,
# which is zero by definition.
while true; do
case "$1" in
-a|-b)
echo "flag $1 set"; sflags="${1#-}$sflags"
shift
;;
-o)
echo "oarg is '$2'"; oarg="$2"
shift; shift
;;
--)
shift; break
;;
esac
done
echo "single-char flags: '$sflags'"
echo "oarg is '$oarg'"
This code will accept any of the following as equivalent:
cmd -aoarg file file
cmd -a -o arg file file
cmd -oarg -a file file
cmd -a -oarg -- file file
SEE ALSO
getopts(1), sh(1), getopt(3)
HISTORY
Written by Henry Spencer, working from a Bell Labs manual page. Behavior believed identical to the Bell version. Example changed in FreeBSD
version 3.2 and 4.0.
BUGS
Whatever getopt(3) has.
Arguments containing white space or embedded shell metacharacters generally will not survive intact; this looks easy to fix but is not. Peo-
ple trying to fix getopt or the example in this manpage should check the history of this file in FreeBSD.
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.
Each shellscript has to carry complex code to parse arguments halfway correctly (like the example presented here). A better getopt-like tool
would move much of the complexity into the tool and keep the client shell scripts simpler.
BSD
January 26, 2011 BSD