What vger99 showed you was in short form a fundamental mechanism for regexps, which is mostly unknown and/or not used to its full capability:
Code:
/<expression1>/ {
command 1
command 2
...
}
This will perform command 1 through command n only to lines, which match the expression. The expression itself does not necessarily have anything to do with the operations performed, it just acts as a filter to decide, onto which lines to apply your commands.
So his sed-oneliner reads in fact: "apply to all lines containing 'setmqaut' the following: replace the end-of-line ('$') with the string '>> ...'"
The a-subcommand gets used only, when you want to append a certain piece of text after a complete line.
bakunin
Thank you for the explanation. No wonder I was having such a hard time getting mine to work correctly.
I am wanting to automate a process that includes the step of appending to a filename a string of text that's contained inside the file. I.e. if filename A.fileA contains a string of text that reads 1234 after the phrase ABC, I want the shell script file to rename the file 1234_FileChecked_A.fileA.... (3 Replies)
Hi
I have an Input of following sort
AAAA:
ProgName="PROGRAM"
BBBB:
ProgName="BBBBBB"
CCCC:
DDDD:
ProgName="PROGRAM"
SSSS:
ProgName="PROGRAM"
ZZZZ:
ProgName="PROGRAM"
I want to find the Lines which are followed by ProgName="PROGRAM"
Out Put
AAAA: (11 Replies)
I have a folder with about 4000 files in it. I need to extract the files that contain a certain line of text to another directory.
for example files with 'ns1.biz.rr.com' need to be extracted to the directory above or some other directory.
I tried using the following but was not successful. (6 Replies)
Hello,
I looking to use grep to return a string with exactly n matches.
I'm building off this:
ls -aLl /bin | grep '^.\{9\}x' | tr -s ' '
-rwxr-xr-x 1 root root 632816 Nov 25 2008 vi
-rwxr-xr-x 1 root root 632816 Nov 25 2008 view
-rwxr-xr-x 1 root root 16008 May 25 2008... (7 Replies)
Hi all,
I need to grep a line from a log file which ensures me that the application server script is executed successfully. Some body please help me on this.
I also need to write a while loop in which i need to use the status of the above grep output. Could some one please tell me how to use... (12 Replies)
Hi all,
I have text file having a number P100. what i need is when i run a script, it should add 1 to the above number and append it to the next line of a same text file.. when i use the script next time it should check the last line and add 1 to the last number and so on..
like the text... (5 Replies)
Good day,
I have a list of regular expressions in file1. For each match in file2, print the containing line and the line after.
file1:
file2:
Output:
I can match a regex and print the line and line after
awk '{lines = $0} /Macrosiphum_rosae/ {print lines ; print lines } '
... (1 Reply)
Platform : Oracle Linux 6.8
Shell : bash
I have a file which has lines like below. These are SELECT queries (SQL)
In each line, I want the word just after FROM keyword to be copied and printed on the top along with the word PROMPT.
The words after FROM clause below are table names. So, they... (6 Replies)
hi all,
trying this using shell/bash with sed/awk/grep
I have two files, one containing one column, the other containing multiple columns (comma delimited).
file1.txt
abc12345
def12345
ghi54321
...
file2.txt
abc1,text1,texta
abc,text2,textb
def123,text3,textc
gh,text4,textd... (6 Replies)
Discussion started by: shogun1970
6 Replies
LEARN ABOUT ULTRIX
egrep
grep(1) General Commands Manual grep(1)Name
grep, egrep, fgrep - search file for regular expression
Syntax
grep [option...] expression [file...]
egrep [option...] [expression] [file...]
fgrep [option...] [strings] [file]
Description
Commands of the family search the input files (standard input default) for lines matching a pattern. Normally, each line found is copied
to the standard output.
The command patterns are limited regular expressions in the style of which uses a compact nondeterministic algorithm. The command patterns
are full regular expressions. The command uses a fast deterministic algorithm that sometimes needs exponential space. The command pat-
terns are fixed strings. The command is fast and compact.
In all cases the file name is shown if there is more than one input file. Take care when using the characters $ * [ ^ | ( ) and in the
expression because they are also meaningful to the Shell. It is safest to enclose the entire expression argument in single quotes ' '.
The command searches for lines that contain one of the (new line-separated) strings.
The command accepts extended regular expressions. In the following description `character' excludes new line:
A followed by a single character other than new line matches that character.
The character ^ matches the beginning of a line.
The character $ matches the end of a line.
A . (dot) 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 an * (asterisk) matches a sequence of 0 or more matches of the regular expression. A regular
expression followed by a + (plus) matches a sequence of 1 or more matches of the regular expression. A regular expression followed
by a ? (question mark) matches a sequence of 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 new line 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 the following: [], then *+?, then concatenation, then | and new
line.
Options-b Precedes each output line with its block number. This is sometimes useful in locating disk block numbers by context.
-c Produces count of matching lines only.
-e expression
Uses next argument as expression that begins with a minus (-).
-f file Takes regular expression (egrep) or string list (fgrep) from file.
-i Considers upper and lowercase letter identical in making comparisons and only).
-l Lists files with matching lines only once, separated by a new line.
-n Precedes each matching line with its line number.
-s Silent mode and nothing is printed (except error messages). This is useful for checking the error status (see DIAGNOSTICS).
-v Displays all lines that do not match specified expression.
-w Searches for an expression as for a word (as if surrounded by `<' and `>'). For further information, see only.
-x Prints exact lines matched in their entirety only).
Restrictions
Lines are limited to 256 characters; longer lines are truncated.
Diagnostics
Exit status is 0 if any matches are found, 1 if none, 2 for syntax errors or inaccessible files.
See Alsoex(1), sed(1), sh(1)grep(1)
06-16-2005
