Hi Folks,
I am trying to write a simple script which involves a potentially infinite loop repeating a number of tasks quickly.
I would like to enable the user to break out of this when he/she wishes (some key stroke) but not to break out of the script (i.e. which is what happens when a user... (4 Replies)
H,
I am running the following log.sh shell script.
$no_of_ps=7
while
do
echo "hello $no_of_ps"
ps_file=`tail -$no_of_ps /tmp/A380_RFS24/test.ls | head -1`
no_of_ps=`expr $no_of_ps - 1`
echo "package is: $ps_file" >> /tmp/A380_RFS24/log/A380_RFS24.log
ps_file1=`echo $ps_file| sed... (1 Reply)
Hi all, im doing this script in which i read from a logfile line by line, my problem is this:
The script was working fine until i added this statement to SSH into another machine to look for some data, it enters and retrieves the data just fine, but for some strange reason after it goes thru the... (1 Reply)
I am having trouble figuring this code
I want to grep a text from a file and if it match certain text it break out of the loop or it should continue searching for the text
Here is what I have written but it isn't working
while true
f=`grep 'END OF STATUS REPORT' filename`
do
if ... (9 Replies)
Hi gurus, I have the following part of code which I am using for treating input
#!/bin/bash
while ]; do
arg=$1; shift
case $arg in
-u)
users="$1"
shift
;;
-g)
groups="$1"
shift
;;
... (4 Replies)
notimes=5
word=excellency
the word excellency contains 10 letters. 10 letters divided by 2 = 5. which means, 5 two-groups of letters are in the word excellency.
i need to perform a function on each group of letters. but the only thing i can think of is the following, which i just know... (5 Replies)
Hi I'm comparing same files names which are in different folders .
The first for loop for the files in DAY1 folder and
the second for loop for the files in DAY2 folder .
the first IF condition is for checking whether the file names are equal
the second If condtion is for checking the... (4 Replies)
OS : RHEL 6.1
Shell : Bash
I had a similair post on this a few weeks back. But I didn't explain my requirements clearly then. Hence starting a new thread now.
I have lots of files in /tmp/stage directory as show below.
I want to loop through each files to run a command on each file.
I... (8 Replies)
I'm obviously very new to this. I'm trying to write a simple for loop that will read the directory names in /Users and then copy a file into the same subdir in each user directory.
I have this, and it works but it isn't great.
#!/bin/bash
HOMEDIRS=/Users/*
for dirs in $HOMEDIRS; do
if ];... (5 Replies)
in my python script i have loop like below:
for item in itemlist:
if <condition>:
<code>
else:
<code>
if <condition>:
if <condition>:
<code>
else:
for type in types:
if... (1 Reply)
Discussion started by: ctrld
1 Replies
LEARN ABOUT OSX
getopt
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.
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 [ $? != 0 ]
then
echo 'Usage: ...'
exit 2
fi
set -- $args
# You cannot use the set command with a backquoted getopt directly,
# since the exit code from getopt would be shadowed by those of set,
# which is zero by definition.
for i
do
case "$i"
in
-a|-b)
echo flag $i set; sflags="${i#-}$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 sh(1), getopt(3)DIAGNOSTICS
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.
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 isn't. 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 correcty (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 April 3, 1999 BSD