grep is a command-line tool for searching text patterns in files
21
votes
6answers
652 views
How can I prevent 'grep' from showing up in ps results?
When I search for some process that doesn't exist, e.g.
$ ps aux | grep fnord
wayne 15745 0.0 0.0 13580 928 pts/6 S+ 03:58 0:00 grep fnord
Obviously I ...
2
votes
3answers
42 views
Very strange behavior with grep and IFS
I'm having trouble using grep, the returned results are "n-empty", I mean without the 'n' character...
This is the script sample :
OLDIFS=$IFS
IFS="\\n"
i=$(grep -ril $1 *)
echo $i
IFS=$OLDIFS
...
1
vote
2answers
32 views
Search and replace full line in recursive files
I'm using:
grep -n -H -o -R -e textword .
List all file recursively under directory '.' with string 'textword' and show the file, line and only portion matching.
I need to remove lines that ...
3
votes
2answers
57 views
How to adjust column width in Linux command output
When I used this command on Red Hat Linux
/usr/sbin/ss -i
I get the following output below:
State Recv-Q Send-Q Local Address:Port ...
3
votes
2answers
47 views
Can I make grep treat escaped multiline as a single line?
How can I make tools like grep treat multilines escaped with a backslash as a long single line?
Let's say I have some files that looks like this:
testvar=test1 \
test2 \
test3
...
5
votes
3answers
164 views
difference between .* and * in regular Expression
I've a file named "test" that contains
linux
Unixlinux
Linuxunix
it's linux
l...x
now when i use grep '\<l.*x\>' , it matches :
linux
it's linux
l...x
but when i use grep '\<l*x\>' ...
1
vote
3answers
74 views
Trying to remove all ids from an HTML file with grep
I'm trying to remove all id=" "s from an .html file but I'm not sure where I am going wrong. I tried using regular expressions but all I am getting is the .html file rendering in my Ubuntu terminal.
...
3
votes
1answer
79 views
Output of `java -version` not matched by grep or awk
On my Linux machine, it isn't clear to me why if I do the following then I don't get only the version string ("1.5.0_32").
# java -version | grep version | awk '{print $NF}'
java version "1.5.0_32"
...
1
vote
2answers
93 views
Unix command for pattern matching
I want to count the number of words and print the matched pattern lines which matches exactly with following pattern:
abc-ERROR:
The input File contains:
# abc-ERROR: xyxxkkfgfr
# def-Error: ...
4
votes
3answers
66 views
Uniquely identifying java processes with same name
I have two java processes which run using the same file name, MyApp.jar (for example).
/usr/java/latest/bin/java -jar MyApp.jar
These jars exist in different places and use different ...
0
votes
1answer
32 views
(e)grep and atomic grouping [comprehension question]
I am trying to understand the correct use of »atomic grouping« a.k.a. »independent subexpressions« a.k.a. »non-backtracking subpattern« [this are the terms I found ...
3
votes
2answers
88 views
greedy and lazy regular expressions (comprehension question)
I am teaching myself regular expressions, and I got stuck at »greedy« vs. »lazy« repeatings.
What I found out so far is that
»greedy« means that the RegExp ...
2
votes
1answer
60 views
How can I get grep to work with “->” as the pattern?
I have this text in a file called temp:
-rw-r--r-- 1 root root 15776 Oct 15 2010 dnd-copy
-rw-r--r-- 1 root root 15776 Oct 15 2010 dnd-link
-rw-r--r-- 1 root root 15776 Oct 15 2010 dnd-move
...
-8
votes
1answer
52 views
can anyone help me with this sed and grep? [closed]
(a) SED
Given a file, replace all the sequences of 4 or more digits with the
word "cat".
(b) GREP
Given a file, display all the lines starting with the word "cat" and
ending with the ...
-4
votes
0answers
36 views
I am really confused with this command [closed]
What does this mean in Linux?
'<([A-z][A-z0-9]*)\b[^>]*>(.*)</\1>'
