from what i know when were dealing with asterisk(*) char in a line we need to use double qoutes. This evaluates the "middle *" (.*) and use escape character on both the first character (^) and last character ($).
Code:
-bash-3.2$ cat test
*ryan*
*you
*me*
-bash-3.2$ cat test | grep "^\*.*\*$"
*ryan*
*me*
-bash-3.2$
I have a program that displays many messages on stdout.
I have another file that contain error messages only - Each line is a separate message. (msgs.txt)
I am trying to show only the errors and not all the output.
I tried this but got nothing:
myprog | grep < msgs.txt
I also tried... (2 Replies)
Hey all! I'm trying to search a file and return all instances of a word, let's say 'foo' in this case, as long as it's not a function name. For example:
1) int foo; //OK
2) //'this is totally fooed up' is also OK
3) int foo (int x, int y) //not ok to return
I've tried a lot of regular... (7 Replies)
I wrote a simple korn shell where I am trying to filter all the good record layouts of a file to only leave the bad ones to look at. That file is hudge. Aside from '# comments' and 'var=ssss', all record should follow a specific record layout, with comma seperated fields. Some fields can have any... (2 Replies)
hi everybody
I am a new user to this forum and its previous posts have been very useful. I'm searching in a file using grep for patterns like
12.13.444
55.44.443
i.e. of form
<digit><digit>.<digit><digit>.<digit><digit><digit>
Can anybody help me with this.
Thanks in advance (4 Replies)
Hi,
I have a file as below,
{####
if file
then
file
else
file
}
print file
i need to fine the count of all the pattern - file, inside the { }
i'm using a grep command as
grep -c \{'*file*'\} fake.sh\
It doesn't gives me any result, i think the problem here is the... (5 Replies)
I need to replace occurrences of twelve asterisks "************" with the string " 0000000.00" . Note that there are two spaces in front of the first zero. How can I do this using awk or sed? (3 Replies)
Please dont delete, im listing my assignment and will be editing as i work on it. I am NOT looking for answers but help in understanding how to use grep
1. The problem statement, all variables and given/known data:
For each question, list the command lines used in addition to any other details... (3 Replies)
I am trying to print columns from a table whose name (header) matches a certain string.
E.g.,
patient1001 patient1002 patient2005 patient3005 patient4001
0 0 0 0 0
2 9 2 8 3
2 7 3 0 2
Say I want to print columns whose names end with "01"
patient1001 patient4001
0 0
2 3
2 2
... (3 Replies)
Use and complete the template provided. The entire template must be completed. If you don't, your post may be deleted!
1. The problem statement, all variables and given/known data:
Given a text file (big_english.txt) containing roughly 250,000 words, answer the following using grep and... (2 Replies)
Hi All,
For the past many days I have solved a lot of grep and regular expression questions, Now I am in a search for a good quality set of questions that can help me build and check my knowledge of grep with regular expressions, it would be great if anyone could help me with my requirement.
... (1 Reply)
Discussion started by: rahulkalra9
1 Replies
LEARN ABOUT POSIX
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