Perl: Conditional replace based on previous and current value in a line Post: 302602789

10 More Discussions You Might Find Interesting

1. Shell Programming and Scripting

replace [previous] line

Hi ,suppose I have a file title=dsafsadf ........ ....... year=1995 author=john smith ............ title=bbbbbb ........ ....... year=1988 author=alex I need to replace the title line with a expression that contains variables year and author. I want to use a python readline for loop....

2. Shell Programming and Scripting

sed conditional string replace for each line

Hi all, I appreciate the enormous amount of knowledge that flows in this forum. I am an average UNIX user. I have many files with lines like the below. I have separated each line with space for ease of reading. I need to replace the first occurance of "/00" with null on those lines that have...

3. Shell Programming and Scripting

Print previous, current and next line using sed

Hi, how can i print the previous, current and next line using sed? current line is the matching line. The following prints all lines containing 'Failure' and also the immediate next line cat $file | sed -n -e '/Failure/{N;p;}' Now, i also want to print the previous line too. Thanks,...

4. Shell Programming and Scripting

How to use sed to search for string and Print previous two lines and current line

Hello, Can anybody help me to correct my sed syntax to find the string and print previous two lines and current line and next one line. i am using string as "testing" netstat -v | sed -n -e '/test/{x;2!p;g;$!N;p;D;}' -e h i am able to get the previous line current line next line but...

5. Shell Programming and Scripting

Printing previous line based on pattern using sed

Hi, I have a written a shell script to get the previous line based on the pattern. For example if a file has below lines: ---------------------------------------------- #UNBLOCK_As _per #As per 205.162.42.92 #BLOCK_As_per #----------------------- #input checks abc.com...

6. UNIX for Dummies Questions & Answers

Awk to print data from current and previous line

Hi guys, I have found your forum super useful. However, right now I am stuck on a seemingly "simple" thing in AWK. I have two columns of data, the first column in Age (in million years) and the second column is Convergence Rate (in mm/yr). I am trying to process my data so I can use it to...

7. Shell Programming and Scripting

Sed Comparing Parenthesized Values In Previous Line To Current Line

I am trying to delete lines in archived Apache httpd logs Each line has the pattern: <ip-address> - - <date-time> <document-request-URL> <http-response> <size-of-req'd-doc> <referring-document-URL> This pattern is shown in the example of 6 lines from the log in the code box below. These 6...

8. Shell Programming and Scripting

Perl to send previous and current value

For example, I have a file called number.txt. x y 1 1 2 4 3 9 4 6 5 5 6 6 7 9 8 4 9 1 10 0 ... And I want to print out the value of x and y, if y%4==0 and the next value of y%4==0. Thus, the sample output is: 1 1 *because the previous x before 2 is 1 2 4 *because 4%4 == 0 7 9...

9. Shell Programming and Scripting

Replace first field of a line with previous filed of the line

Hi Everyone, I have a file as below: IM2345638,sherfvf,usha,30 IM384940374,deiufbd,usha,30 IM323763822,cdejdkdnbds,theju,15 0,dhejdncbfd,us,20 IM398202038,dhekjdkdld,tj,30 0,foifsjd,u2,40 The output i need is as below IM2345638,sherfvf,usha,30...

10. Shell Programming and Scripting

sed conditional \n replace for each line

How could be removed \n only if appearing at position 80 in the line?

LEARN ABOUT LINUX

shtool-path

SHTOOL-PATH.TMP(1)					      GNU Portable Shell Tool						SHTOOL-PATH.TMP(1)

NAME

       shtool-path - GNU shtool command dealing with shell path variables

SYNOPSIS

       shtool path [-s|--suppress] [-r|--reverse] [-d|--dirname] [-b|--basename] [-m|--magic] [-p|--path path] str [str ...]

DESCRIPTION

       This command deals with shell $PATH variables. It can find a program through one or more filenames given by one or more str arguments.  It
       prints the absolute filesystem path to the program displayed on "stdout" plus an exit code of 0 if it was really found.

OPTIONS

       The following command line options are available.

       -s, --suppress
	   Supress output. Useful to only test whether a program exists with the help of the return code.

       -r, --reverse
	   Transform a forward path to a subdirectory into a reverse path.

       -d, --dirname
	   Output the directory name of str.

       -b, --basename
	   Output the base name of str.

       -m, --magic
	   Enable advanced magic search for ""perl"" and ""cpp"".

       -p, --path path
	   Search in path. Default is to search in $PATH.

EXAMPLE

	#   shell script
	awk=`shtool path -p "${PATH}:." gawk nawk awk`
	perl=`shtool path -m perl`
	cpp=`shtool path -m cpp`
	revpath=`shtool path -r path/to/subdir`

HISTORY

       The GNU shtool path command was originally written by Ralf S.  Engelschall <rse@engelschall.com> in 1998 for Apache. It was later taken
       over into GNU shtool.

SEE ALSO

       shtool(1), which(1).

18-Jul-2008							   shtool 2.0.8 						SHTOOL-PATH.TMP(1)

10 More Discussions You Might Find Interesting

1. Shell Programming and Scripting

replace [previous] line

Discussion started by: grossgermany

2. Shell Programming and Scripting

sed conditional string replace for each line

Discussion started by: Nanu_Manju

3. Shell Programming and Scripting

Print previous, current and next line using sed

Discussion started by: ysrinu

4. Shell Programming and Scripting

How to use sed to search for string and Print previous two lines and current line

Discussion started by: nmadhuhb