How can i make something like
if (echo "$arg2" | egrep -s '^+\.+km/h+$|^+km/h+$'); then
not to output the value of $arg2 on the screen, evertime i get match it outputs the value of the variable on the screen which i don't need to do. I know for grep its -q option but it doesn't work for egrep.... (2 Replies)
Hi
I am trying to use this command:
egrep '^a{2,6}$' testexpr4D
to retreive lines with 2,3,4,5, or 6 a's in a file .
The file testexpr4D has entries like:
a
aa
aaa
aaaa
aaaaa
aaaaaa
123456
ABCDEF
I was expecting to see 5 lines in the output but nothing happens.
Can anyone help... (10 Replies)
Hi I've been searching google and have not found what egrep -c means. Does anyone know where I can get a cheat sheet or what that -c means?
thanks,
Linda (2 Replies)
Hi,
I don't understand what is the correct way of writing:
egrep -l '{$min,$max} $pattern' $filename
I tryed to search on google how to wtrite {$min, $max}, but I don't have success (7 Replies)
Hi Guys,
we have a shell script which basically query the Database which retrieves huge data and use the data with "egrep" .
Now there is some data which contains characters like "abc)" and the same is used like below :
"egrep (.+\|GDPRAB16\|GDPR/11702 96 abc)\|$ temp.txt"
now while... (7 Replies)
I want to egrep for certain fields which are not existing in the current log files and am getting errors for that...
egrep "'^20090220.14'|'^20090220.15'|'^20090220.16'|'^20090220.17'|'^20090220.18'"
Some of the times are in future and logs don't have those entries and I get errors for them... (1 Reply)
Hello all,
I'm a first time poster and a unix/linux noob so please be understanding.
I am trying this command below:
# egrep -c "Oct".+"Connect: ppp" /var/log/messages*
/var/log/messages:53
/var/log/messages.1:35
/var/log/messages.2:63
/var/log/messages.3:27
/var/log/messages.4:12
... (1 Reply)
Hi, i have a a bunch of directories that are always named with six lowercase alpha's and either one or two numeric's (but no more)
so for example names could be
qwerty1
qwerty9
qwerty10
qwerty67
I am currently using two pattern matches to capture these names
echo $DIR |... (8 Replies)
Its really 2 questions, but both are pretty basic.
Linux Redhat
1. Need to do a search and replace on a file.
I need to append '--' (comment out the line) to specific lines based on a wildcard search.
So if I Have
GRANT SOME_ROLE_OR_USER ...
I dont care what comes after that.... (2 Replies)
Hi,
I have a question, during my readings it appears that these two variables in the snippet below need to be on the same line to return a “true” answer and listed in the output otherwise it won’t be returned. How can I write this snippet to make it return a “true” if those two variables are on... (6 Replies)
Discussion started by: bdby
6 Replies
LEARN ABOUT V7
grep
GREP(1) General Commands Manual GREP(1)NAME
grep, egrep, fgrep - search a file for a pattern
SYNOPSIS
grep [ option ] ... expression [ file ] ...
egrep [ option ] ... [ expression ] [ file ] ...
fgrep [ option ] ... [ strings ] [ file ]
DESCRIPTION
Commands of the grep family search the input files (standard input default) for lines matching a pattern. Normally, each line found is
copied to the standard output; unless the -h flag is used, the file name is shown if there is more than one input file.
Grep patterns are limited regular expressions in the style of ed(1); it uses a compact nondeterministic algorithm. Egrep patterns are full
regular expressions; it uses a fast deterministic algorithm that sometimes needs exponential space. Fgrep patterns are fixed strings; it
is fast and compact.
The following options are recognized.
-v All lines but those matching are printed.
-c Only a count of matching lines is printed.
-l The names of files with matching lines are listed (once) separated by newlines.
-n Each line is preceded by its line number in the file.
-b Each line is preceded by the block number on which it was found. This is sometimes useful in locating disk block numbers by con-
text.
-s No output is produced, only status.
-h Do not print filename headers with output lines.
-y Lower case letters in the pattern will also match upper case letters in the input (grep only).
-e expression
Same as a simple expression argument, but useful when the expression begins with a -.
-f file
The regular expression (egrep) or string list (fgrep) is taken from the file.
-x (Exact) only lines matched in their entirety are printed (fgrep only).
Care should be taken when using the characters $ * [ ^ | ? ' " ( ) and in the expression as they are also meaningful to the Shell. It is
safest to enclose the entire expression argument in single quotes ' '.
Fgrep searches for lines that contain one of the (newline-separated) strings.
Egrep accepts extended regular expressions. In the following description `character' excludes newline:
A followed by a single character matches that character.
The character ^ ($) matches the beginning (end) of a line.
A . matches any character.
A single character not otherwise endowed with special meaning matches that character.
A string enclosed in brackets [] matches any single character from the string. Ranges of ASCII character codes may be abbreviated
as in `a-z0-9'. A ] may occur only as the first character of the string. A literal - must be placed where it can't be mistaken as
a range indicator.
A regular expression followed by * (+, ?) matches a sequence of 0 or more (1 or more, 0 or 1) matches of the regular expression.
Two regular expressions concatenated match a match of the first followed by a match of the second.
Two regular expressions separated by | or newline match either a match for the first or a match for the second.
A regular expression enclosed in parentheses matches a match for the regular expression.
The order of precedence of operators at the same parenthesis level is [] then *+? then concatenation then | and newline.
SEE ALSO ed(1), sed(1), sh(1)DIAGNOSTICS
Exit status is 0 if any matches are found, 1 if none, 2 for syntax errors or inaccessible files.
BUGS
Ideally there should be only one grep, but we don't know a single algorithm that spans a wide enough range of space-time tradeoffs.
Lines are limited to 256 characters; longer lines are truncated.
GREP(1)