extract string portion from filename using sed

Login or Register for Dates, Times and to Reply

Thread Tools Search this Thread
Top Forums Shell Programming and Scripting extract string portion from filename using sed
# 1  
extract string portion from filename using sed

Hi All,

I posted something similar before but I now have a another problem.

I have filenames as below


i need to extract the dates as in bold. Using bash v 3.xx

Im trying to using the print sed command but not getting the result I want

source_file_issue_date=`echo $fname | sed '/_[0-9][0-9]*[.]/p'`
echo "source_file_issue_date: $source_file_issue_date"

Appreciate any ideas?!

Kind Regards
# 2  
realised I have to use substitute but but still no joy :-(

sed 's/^.*[a-zA-Z]*[.][0-9][0-9]$//'`
# 3  

sed 's/.*_\(.*\)\..*/\1/'

# 4  
works like a treat!

now Im trying to figure the logic behind it!

Thanks again :-)

# 5  
# ls -1 TOP*|awk 'BEGIN{FS="[_.]"}{print $(NF-1)}'

# 6  
BTW, there is no need to invoke sed to parse the filename. It can all be done within bash i.e.
$ fname="TOP_TABIN240_20090323.200903231830"
$ source_file_issue_date=$(tmp=${fname/*_}; echo ${tmp/\.*})
$ echo "source_file_issue_date: $source_file_issue_date"
source_file_issue_date: 20090323

# 7  
yup, I have to say this is all a learning experience!

Thanks to all for feedback!

Login or Register for Dates, Times and to Reply

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

Test Your Knowledge in Computers #117
Difficulty: Easy
BSD (Berkley Software Distribution) is not an example of an OS derived from Unix.
True or False?

10 More Discussions You Might Find Interesting

1. UNIX for Beginners Questions & Answers

Extract a portion of string from each line in Linux

Hi I have to extract the destination path information from each record the file is of variable length so I will not be able to use the print command.The search should start on variable "destinationPath" and it should end at immediate "," also the first field has to be printed Input File:... (7 Replies)
Discussion started by: rkakitapalli
7 Replies

2. Shell Programming and Scripting

Extract filename from a given string

I want to extract the filename from a string. This is how I have the rawdata ina file /home/sid/ftp/testing/abc.txt /home/sid/ftp/tested/testing/def.txt /home/sid/sftp/date/misc/hij.txt i want a script which would provide me an output like this Directory ... (10 Replies)
Discussion started by: sidnow
10 Replies

3. Shell Programming and Scripting

Extracting a portion of the filename

Hi I would like to extract the first portion of filename from a list of files. The filename pattern is of the form 123456789_TEXT_TEXT_TEXT_.csv. I want to extract just the numerical portion of this filename from the list of files and then output this into another text file. K (6 Replies)
Discussion started by: kamal_p_99
6 Replies

4. Shell Programming and Scripting

Extract string from filename

Hi I need to extract the string from file name filename: FILENAME_STRUT_01032013_XXXXXXX.TXT I want 01032013 from the above file name. number of characters may differ before the required string but underscores(-) are same number i.e. after second underscore. Please advise on this. ... (2 Replies)
Discussion started by: cnrj
2 Replies

5. Shell Programming and Scripting

extract every filename containing certain string in a directory and do some commend per file

Hi, Here is my question: suppose I have files like 1990_8xdaily_atmos.nc 1991_8xdaily_atmos.nc 1992_8xdaily_atmos.nc 1993_8xdaily_atmos.nc 1990_daily_atmos.nc 1991_daily_atmos.nc 1992_daily_atmos.nc 1993_daily_atmos.nc 1990_month_atmos.nc 1991_month_atmos.nc 1992_month_atmos.nc... (1 Reply)
Discussion started by: 1988PF
1 Replies

6. Shell Programming and Scripting

How to extract portion of a string?

Hi Gurus, Would like to seek some help on how to extract a portion of string from log's output as shown below. Sample of raw data: piece handle=/test123/disk_dump/test123/df0_cntrl_PCPFCI20120404_68498 tag=TAG20120404T180035 comment=NONE piece... (13 Replies)
Discussion started by: superHonda123
13 Replies

7. Shell Programming and Scripting

extract string portion using sed

Hi All I have 3 files as listed below and highlighted in bold the portions of the filenames I need to extract: TOS_TABIN218_20090323.200903231830 TOS_TABIN219_1_20090323.200903231830 TOS_TABIN219_2_20090323.200903231830 I tried source_tabin_name=`echo $fname | sed 's/_.*//'` but I... (6 Replies)
Discussion started by: santam
6 Replies

8. Shell Programming and Scripting

Match portion of the filename

hi, I have a script which accept filename and process them, however, one of the file needs 'special' handling so I need to identify it, say the filename contains the word "STOCK" (i.e. NEWYORKSTOCKLIST20060627.txt), I want to check if the filename contains the word "STOCK", how can I do that?... (1 Reply)
Discussion started by: mpang_
1 Replies

9. Shell Programming and Scripting

need help on sed (replace string without changing filename)

I have awhole bunch of files and I want to edit stringA with stringB without changing the filename. I have tried the following sed commands: sed "s/stringA/stringB/g" * This will print the correct results but does not actually save it with the new content of the file. when I do a cat on... (5 Replies)
Discussion started by: jjoves
5 Replies

10. UNIX for Dummies Questions & Answers

How to extract a portion of a string from the whole string

How to extract a portion of a string from a full string using unix. For example: Say source string is = "req92374923.log" I want only the numeric portion of the string say "92374923" how to do that in Unix. (2 Replies)
Discussion started by: ds_sastry
2 Replies

Featured Tech Videos