Finding lines with a regular expression, replacing them with blank lines
So the tag for this forum says all newbies welcome...
All I want to do is go through my file and find lines which contain a given string of characters then replace these with a blank line. I really tried to find a simple command to do this but failed.
Here's what I did come up with though:
So I find a REGEXP, replace that and the rest of the line with "MARKER", then I replace the start of the line, including "MARKER" with nothing, thus leaving behind a blank entry...
I am trying to use regular expression to identify ONLY the commands that hasn't the word "tablespace" within it. a command starts with "create table" and ends with ; (semicolon)
example file:
create table first tablespace ;
create table second
(
BBL_CUSTOMER_NAME VARCHAR2(32),
a... (7 Replies)
Hi i am trying to replace blank lines with a number 0. I tried the following code
awk '{print NF ? $0: blankrow}' blankrow = "0" file1.prg>file2.prg
however i get the following error: fatal: cannot open file `blankrow' for reading (No such file or directory)
file example:
1
2
3
5
6... (11 Replies)
Hi,
I need a regular expression grepping all lines starting with '*' followed by a VARIOUS number of blanks and then followed by the string 'Runjob=1'.
I tried that code, but it doesn't work:
grep -i '*'+'Runjob=1' INPUT_FILE >>OUTPUT_FILE
Can someone help me?
Thanks (8 Replies)
Hey, I found a way to print the lines which is just before a regular expression, not including the expression.
sed -n '/regexp/{n;p;}' myfile
Now I'm looking for a way to print all lines, exept the regular expression and also the line before the same regular expression.
Use code tags. (1 Reply)
I would like to print 3 lines after a regular expression is found in the logfile. I'm using the following code:
grep -n "$reg_exp" file.txt |while read LINE ;do i=$(echo $LINE |cut -d':' -f1 ) ;sed -n "$i,$(($i+3))p" file.txt ;done
The above code things works fine,but sometimes gives erroneous... (3 Replies)
Hi.. I'm facing a trouble in replacing two blank lines in a file using shell script...
I used sed to search a line and insert two blank lines after the searchd line using the following sed command.
Sed "/data/{G;G;}/" filename. In the file, after data tag, two lines got inserted blank lines.. Now... (1 Reply)
Hi.. I'm facing a trouble in replacing two blank lines in a file using shell script...
I used sed to search a line and insert two blank lines after the searchd line using the following sed command.
sed "/data/{G;G;}/" filename . In the file, after data tag, two lines got inserted blank lines..... (4 Replies)
I have a very large file (over 700 million lines) that has some lines that I need to delete. An example of 5 lines of the file:
HS4_80:8:2303:19153:193032 153 k80:138891
HS4_80:8:2105:5544:43174 89 k88:81949
165 k88:81949 323 0 * = 323 0 ... (6 Replies)
Using a regular expression, I would like multiple lines to be matched.
By default, a period (.) matches any character except newline. However, (?s) and /s modifiers are supposed to force . to accept a newline and to match any character including a newline.
However, the following two perl... (4 Replies)
Discussion started by: LessNux
4 Replies
LEARN ABOUT REDHAT
expr
EXPR(1) FSF EXPR(1)NAME
expr - evaluate expressions
SYNOPSIS
expr EXPRESSION
expr OPTION
DESCRIPTION --help display this help and exit
--version
output version information and exit
Print the value of EXPRESSION to standard output. A blank line below separates increasing precedence groups. EXPRESSION may be:
ARG1 | ARG2
ARG1 if it is neither null nor 0, otherwise ARG2
ARG1 & ARG2
ARG1 if neither argument is null or 0, otherwise 0
ARG1 < ARG2
ARG1 is less than ARG2
ARG1 <= ARG2
ARG1 is less than or equal to ARG2
ARG1 = ARG2
ARG1 is equal to ARG2
ARG1 != ARG2
ARG1 is unequal to ARG2
ARG1 >= ARG2
ARG1 is greater than or equal to ARG2
ARG1 > ARG2
ARG1 is greater than ARG2
ARG1 + ARG2
arithmetic sum of ARG1 and ARG2
ARG1 - ARG2
arithmetic difference of ARG1 and ARG2
ARG1 * ARG2
arithmetic product of ARG1 and ARG2
ARG1 / ARG2
arithmetic quotient of ARG1 divided by ARG2
ARG1 % ARG2
arithmetic remainder of ARG1 divided by ARG2
STRING : REGEXP
anchored pattern match of REGEXP in STRING
match STRING REGEXP
same as STRING : REGEXP
substr STRING POS LENGTH
substring of STRING, POS counted from 1
index STRING CHARS
index in STRING where any CHARS is found, or 0
length STRING
length of STRING
+ TOKEN
interpret TOKEN as a string, even if it is a
keyword like `match' or an operator like `/'
( EXPRESSION )
value of EXPRESSION
Beware that many operators need to be escaped or quoted for shells. Comparisons are arithmetic if both ARGs are numbers, else lexicograph-
ical. Pattern matches return the string matched between ( and ) or null; if ( and ) are not used, they return the number of characters
matched or 0.
AUTHOR
Written by Mike Parker.
REPORTING BUGS
Report bugs to <bug-coreutils@gnu.org>.
COPYRIGHT
Copyright (C) 2002 Free Software Foundation, Inc.
This is free software; see the source for copying conditions. There is NO warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICU-
LAR PURPOSE.
SEE ALSO
The full documentation for expr is maintained as a Texinfo manual. If the info and expr programs are properly installed at your site, the
command
info expr
should give you access to the complete manual.
GNU coreutils 4.5.3 February 2003 EXPR(1)