Sed on first instance only Post: 302288519

10 More Discussions You Might Find Interesting

1. Shell Programming and Scripting

replace first instance(not first instance in line)

Alright, I think I know what I am doing with sed(which probably means I don't). But I cant figure out how to replace just the first occurance of a string. I have tried sed, ed, and grep but can't seem to figure it out. If you have any suggestions I am open to anything!

2. Shell Programming and Scripting

sed replace 2nd instance

Hello, I want to replace 2nd instance of "foo" in a file use sed. Any suggestions?

3. Shell Programming and Scripting

sed command - substitue first instance

hi i have one file where i want to substitute only first instance of swap with swap1 i want to replcae only first instance of swap in my script i know we can do this with awk. but i need to do this with sed only i tried follwoing code sed 's/swap/swap1' filename but here all...

4. Shell Programming and Scripting

sed/awk: Delete matching words leaving only the first instance

I have an input text that looks like this (comes already sorted): on Caturday 22 at 10:15, some event on Caturday 22 at 10:15, some other event on Caturday 22 at 21:30, even more events on Funday 23 at 11:00, yet another event I need to delete all the matching words between the lines, from...

5. Shell Programming and Scripting

sed appending needed only after first instance

Hi, Here is my piece of code used with sed in shell script: sed -i '/<falsemodule-option>/ a\<LdapLogin>' myxmlfile The problem that i am facing with the above is that in 'myxml' file i have mulitple instances of <falsemodule-option> so when i execute the above sed command, it is appending...

6. Shell Programming and Scripting

sed: how to limit pattern search to first instance only

I need to reduce a file's size below 50MB by deleting chucks of text. The following sed does this. sed '/^begpattern/,/endpattern/d' myfile However, it's possible that the file size can get below 50MB by just deleting the first instance of the pattern. How do I code that into sed? Or can awk...

7. Shell Programming and Scripting

Using sed can you specify the last instance of a character on a line?

I was told a way to do this with awk earlier today but is there a way with sed to specify the last instance of a character on a line? You will know what character you're looking for but there could be none or one hundred instances of it on a line say and you ONLY want to specify the last one for...

8. Shell Programming and Scripting

sed command to print first instance of pattern in range

The following text is in testFile.txt: one 5 two 10 three 15 four 20 five 25 six 10 seven 35 eight 10 nine 45 ten 50 I'd like to use sed to print the first occurance of search pattern /10/ in a given range. This command is to be run against large log files, so to optimize efficiency,...

9. Shell Programming and Scripting

sed for first instance of a pattern

Hi Everyone, I have the below information from a log file: LOAD SUMMARY ============ WRT_8036 Target: TGT_1_TAB (Instance Name: ) WRT_8039 Inserted rows - Requested: 3929 Applied: 0 Rejected: 3929 Affected: 0 Mutated from update: 3929 WRT_8041 Updated rows ...

10. Shell Programming and Scripting

sed to grab first instance of a range

Hi all, I'm new to the forum and also relatively new to sed and other such wonderfully epic tools. I'm attempting to grab a section of text between two words, but it seems to match all instances of the range instead of stopping at just the first. This occurs when I use: sed -n...

LEARN ABOUT DEBIAN

sethead

sethead(1) General Commands Manual sethead(1)

Name
sethead - Set FITS or IRAF header keyword values

Synopsis
sethead [-dknv][r letter] <FITS or IRAF file> kw1=val1 kw2=val2 ... kwn=valuen

Description
Set parameters in the header of a FITS or IRAF image. If the keywords do not already exist, they are added at the end of the header. Val-
ues are assumed to be numeric if they contain no alphabetic characters and right-aligned. Otherwise they are left-aligned after the equals
sign, and padded by spaces to a minimum of 8 characters. To set keywords in a list of files, substitute @<listfile> for the file names on
the command line. To set a lot of keywords, put them, one per line, in a file and substitute @<keylistfile> on the command line. If two @
commands are present, the program will figure out which contains file names and which contains keywords. Lines in a keyword list file
which do not contain an = are ignored.

Options
-h Write HISTORY line into output header with sethead version, current date and time, and names of keywords set.

-k Write SETHEAD keyword into output header with sethead version, current date and time, and names of keywords set. If a SETHEAD key-
word already exists, move the old value to a HISTORY line before writing the new value

-n Write a new file with an added "e" before the extension.

-r letter
Rename existing keywords whose values are being reset by prepending the character "letter". Drop the last character if the changed
keyword is already 8 characters long.

-v Print confirmations of each parameter setting

Web Page
http://tdc-www.harvard.edu/software/wcstools/sethead.html

Author
Doug Mink, SAO (dmink@cfa.harvard.edu)

6 July 2001 WCSTools sethead(1)

10 More Discussions You Might Find Interesting

1. Shell Programming and Scripting

replace first instance(not first instance in line)

Discussion started by: IronHorse7

2. Shell Programming and Scripting

sed replace 2nd instance

Discussion started by: katrvu

3. Shell Programming and Scripting

sed command - substitue first instance

Discussion started by: d_swapneel14

4. Shell Programming and Scripting

sed/awk: Delete matching words leaving only the first instance

Discussion started by: GrinningArmor