Visit The New, Modern Unix Linux Community

search & replace pattern

Thread Tools Search this Thread
Top Forums Shell Programming and Scripting search & replace pattern
# 1  
search & replace pattern


My problem is that I have to search a changing pattern and replace it with the wild card char "*"

i/p: 99_*_YYYYMMDD_SRC.txt.tar.gz
o/p: 99_*_*_SRC.txt.tar.gz

The problem is that YYYYMMDD pattern is not static. It could be YYYYMMDDHHMI or could be YYYYMMDDHHMISS.

Can someone please help me here?

# 2  
echo '99_*_YYYYMMDD_SRC.txt.tar.gz' | nawk -F_ '$3="*"' OFS=_

# 3  
Hi vgersh,

Thanks!! for your quick solution it worked with this kind of pattern.........(had to replace nawk by seems nawk is not supported on my linux)

But it slipped my mind Smilie to mention that I have to first search for YYYYMMDD like pattern meaning it is not certain that it'll be at the 3rd position only. It could be anywhere in the string like

instead of 99_*_YYYYMMDD_SRC.txt.tar.gz
it could be 99_*_SRC_YYYYMMDD.txt.tar.gz
or YYYYMMDD_99_*_SRC.txt.tar.gz

I mean to say it could be anywhere in the string.....sorry for the confusion Smilie

# 4  
assuming the minimum number of digits in the pattern to be 'blanked out' is 4:
nawk '{sub("[0-9][0-9][0-9][0-9][0-9]*","*")}1' myFile
sed 's#[0-9]\{4,\}#*#' myFile

# 5  
Hi vgersh,

I tried your code

echo 45_*_YYYYMMDD_SRC.txt.tar.gz | sed 's#[0-9]\{4,\}#*#'

but it returned the same string

# 6  
Originally Posted by dips_ag
Hi vgersh,

I tried your code

echo 45_*_YYYYMMDD_SRC.txt.tar.gz | sed 's#[0-9]\{4,\}#*#'

but it returned the same string

I assumed the 'YYYYMMDD' was actually a mnemonic for the date/time numeric spec.
If you want to take 'YYYYMMDD' literally - that's even easier...:
sed 's#YYYY[^_.]*#*#' myFile

This User Gave Thanks to vgersh99 For This Post:
# 7  
Hi Vgersh,

Thanks for the solution Smilie!!

Can you please explain this sed command ?


Previous Thread | Next Thread
Thread Tools Search this Thread
Search this Thread:
Advanced Search

Test Your Knowledge in Computers #142
Difficulty: Easy
Version 4 Unix was rewritten in C in 1977.
True or False?

10 More Discussions You Might Find Interesting

1. Shell Programming and Scripting

Search & Replace

Hi Gurus, I have two files. I want to read sessoin_name from the file1 and replace $Param4 & $Param5 in file2 with connection_name in specified in file1. The file1 will have data in following format File 1 session_name,connection_name s_abcd,Listener_2 s_def,Listener_1 source file... (7 Replies)
Discussion started by: r_t_1601
7 Replies

2. Shell Programming and Scripting

Search & Replace

Hi all Please can you help me with a script to check several files for the following string: encoding=""and replace it with: encoding="UTF-8"I did the following, : #!/bin/sh string1="encoding=""" string2="encoding="UTF-8" sed 's/'"$string1"'/'"$string2"'/g'but does not work. Please can... (18 Replies)
Discussion started by: fretagi
18 Replies

3. Shell Programming and Scripting

Mutli line pattern search & replace in a xml file

Hello guys, I need your help for a specific sed command that would search for a multi line pattern and if found, would replace it by another multi line pattern. For instance, here is the input: <RefNickName>abcd</RefNickName> <NickName>efgh</NickName> <Customize> ... (0 Replies)
Discussion started by: xciteddd
0 Replies

4. Shell Programming and Scripting

perl:: search for tow pattern and replace the third pattern

Hi i want to search two pattern on same line and replace onther pattern.. INPut file aaaa bbbbb nnnnnn ttttt cccc bbbbb nnnnnn ppppp dddd ccccc nnnnnn ttttt ffff bbbbb oooooo ttttt now i want replace this matrix like.. i want search for "bbbbb","nnnnnn" and search and replace for... (4 Replies)
Discussion started by: nitindreamz
4 Replies

5. UNIX for Dummies Questions & Answers

Search & Replace

Hi , I ahve a text file which has several instances of the text such as run_time: 09:30 I need to add double quotes before and after the time value i.e: run_time: "09:30" Any suggestions on how to go about the same (4 Replies)
Discussion started by: jobbyjoseph
4 Replies

6. Shell Programming and Scripting

SED Search Pattern and Replace with the Pattern

Hello All, I have a string "CP_STATUS OSSRC_R6_0_Shipment_R1H_CU AOM_901046 R1H_LLSV1_2008031", and I just want to extract LLSV1, but I dont get the expected result when using the sed command below. # echo "CP_STATUS OSSRC_R6_0_Shipment_R1H_CU AOM_901046 R1H_LLSV1_2008031" | awk '{print... (4 Replies)
Discussion started by: racbern
4 Replies

7. Shell Programming and Scripting

Search for a Pattern and Replace

Hello All, Can you help me with this , I need to search a pattern replace it with the new pattern in all the files in a directory. what would be the easiest way to do that? Thanks in advance. :) Sam, (6 Replies)
Discussion started by: sbasetty
6 Replies

8. Shell Programming and Scripting

Need help with search & replace

I have a file that has some accent characters in it when viewed in some text editors, but when viewed in vi they come in as ~R and ~U. I need to make a script to remove these characters from the file, but have been unsuccessful. I am not sure how sed or awk, or something similar is viewing them,... (8 Replies)
Discussion started by: tcovert
8 Replies

9. Shell Programming and Scripting

Search & replace

Is there any way we can achieve search & replace with awk? I could achieve the same with sed in following way - sed 's/A/B/g' file1 > file2 But the same regex if I try with using awk following way, awk 's/A/B/g' file1 > file2 it gives me Syntax error. I strongly believe I am... (1 Reply)
Discussion started by: videsh77
1 Replies

10. Shell Programming and Scripting

Help, sed search&replace

Plzzzz, tell me some script about this... What does this mean ? sed '/^ */s///' sed '/^/s// /' and why it's diferent ??? sed '/ */s// /g' and sed 's/ */ /g'. It's all the same ??? Thanks you very much (2 Replies)
Discussion started by: mle
2 Replies

Featured Tech Videos