04-18-2010
10 More Discussions You Might Find Interesting
1. Shell Programming and Scripting
Hi I am new to shell script programming...
want to know the process of the following:
if
then
echo "$0: missing argument for option(s) :$MISSINGOPTARG"
echo "usage" $USAGE"
exit 1
fi (1 Reply)
Discussion started by: chandhar
1 Replies
2. Shell Programming and Scripting
how does below tr command replace nonletters with newlines?
I think I understand tr -cs '\n' part.. but what is
A-Za-z\' <--- what is this??
tr -cs A-Za-z\' '\n' |
-c --complement
-s, --squeeze-repeats
replace each input sequence of a repeated character that is... (0 Replies)
Discussion started by: convenientstore
0 Replies
3. Shell Programming and Scripting
Could someone give me a quick simple explanation for the AWK command.
And also help me to explain the code i have made. I have made some general comments about it myself. I was wondering if people could help me with the rest:
awk -F'' 'END {
fmt = "%-20s\t%s\t%s\n" ... (0 Replies)
Discussion started by: amatuer_lee_3
0 Replies
4. Shell Programming and Scripting
Hi
I have a line/command which greps certain pattern () from the file and 22 lines AFTER that:
nawk '/\/{c=22}c&&c--' input_file
Can somebody explain the coding in this command (what " c&&c-- " does)? and how to modify this command to output 22 lines BEFORE this pattern () Thanks a lot ... (3 Replies)
Discussion started by: aoussenko
3 Replies
5. Homework & Coursework Questions
I have the following piece of codes. Please explain it to me in great detail how are these codes working.
1. #include <stdio.h>
int main(){
int x;
x=0;
while (x<2 && fork()){
if (!fork()) execlp("echo","x++","x",0);
x++;
system("echo x+x");
}
}
2.
#include <stdio.h>
int i;... (1 Reply)
Discussion started by: prakashabii
1 Replies
6. UNIX for Dummies Questions & Answers
Its great someone provided this script that strips out a filename and extension but can someone explain how each line works?
file1='Jane Mid Doe.txt'
newfile='Jane.txt'
1) ext=${file1##*.}
2) filename=${file%%.???}
3) set -- $filename
4) newfile="1.$extension" (1 Reply)
Discussion started by: Lillyt
1 Replies
7. UNIX for Dummies Questions & Answers
Hi all,
I need your help in understanding the meaning and syntax of the below nawk line.
Here is an extract of a script which I use daily and works well. The script extracts the hostnames and messages within a syslog file. I would also like to extract the message time in the 3rd column by... (2 Replies)
Discussion started by: wthomas
2 Replies
8. UNIX for Dummies Questions & Answers
I need someone to tell me how exactly works the following code αfter /etc/passwd :eek::
cat /etc/passwd|grep "^:"|sed '1,$s/^\(*\):*:\(*\):.*$/ \1 \2 /'|sort -nrk3 -t:I want a good explanation to understand the code please (4 Replies)
Discussion started by: kotsos13
4 Replies
9. Homework & Coursework Questions
1. I've been asked to provide a detailed description on how Minix's source code is organised. This may sound slightly simple, but what exactly am I to refer to when explaining? Any documents that would provide assistance to understand whats being asked? Thanks
2. Not applicable:
3.... (1 Reply)
Discussion started by: Menace12
1 Replies
10. Shell Programming and Scripting
Hi. Can somebody please explain the following lines of KSH code for me? The code checks all sub directories in a specific location which are numbered (E.g. test_01, test_02 ... etc.), then finds the one with highest number and extracts that number from the dir name into the variable num. I'd just... (9 Replies)
Discussion started by: user052009
9 Replies
LEARN ABOUT DEBIAN
libbash
LIBBASH(7) libbash Manual LIBBASH(7)
NAME
libbash -- A bash shared libraries package.
DESCRIPTION
libbash is a package that enables bash dynamic-like shared libraries. Actually its a tool for managing bash scripts whose functions you may
want to load and use in scripts of your own.
It contains a 'dynamic loader' for the shared libraries ( ldbash(1)), a configuration tool (ldbashconfig(8)), and some libraries.
Using ldbash(1) you are able to load loadable bash libraries, such as getopts(1) and hashstash(1). A bash shared library that can be loaded
using
ldbash(1) must answer 4 requirments:
1. It must be installed in $LIBBASH_PREFIX/lib/bash (default is /usr/lib/bash).
2. It must contain a line that begins with '#EXPORT='. That line will contain (after the '=') a list of functions that the library
exports. I.e. all the function that will be usable after loading that library will be listed in that line.
3. It must contain a line that begins with '#REQUIRE='. That line will contain (after the '=') a list of bash libraries that are
required for our library. I.e. every bash library that is in use in our bash library must be listed there.
4. The library must be listed (For more information, see ldbashconfig(8)).
Basic guidelines for writing library of your own:
1. Be aware, that your library will be actually sourced. So, basically, it should contain (i.e define) only functions.
2. Try to declare all variables intended for internal use as local.
3. Global variables and functions that are intended for internal use (i.e are not defined in '#EXPORT=') should begin with:
__<library_name>_
For example, internal function myfoosort of hashstash library should be named as
__hashstash_myfoosort
This helps to avoid conflicts in global name space when using libraries that come from different vendors.
4. See html manual for full version of this guide.
AUTHORS
Hai Zaar <haizaar@haizaar.com>
Gil Ran <ril@ran4.net>
SEE ALSO
ldbash(1), ldbashconfig(8), getopts(1), hashstash(1) colors(1) messages(1) urlcoding(1) locks(1)
Linux Epoch Linux