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# 1  
Old 08-07-2015
Using ls command
Dear All,

I will be having the below files in a directory.
Code:
FORM_9757_TYUIOP_1.DAT
FORM_9840_OPRTOP_2.DAT
FORM_9757_TIRTOP_3.DAT

So, from the directory, I have to find only those file which have "OP" at the highlighted position. The file name format is fixed.

Please help Smilie
Last edited by vbe; 08-07-2015 at 06:08 AM..
# 2  
Old 08-07-2015
Hello,

the wildcard for a single character is ?, so your ls-command would look like this:
Code:
$ touch FORM_9757_TYUIOP_1.DAT FORM_9840_OPRTOP_2.DAT FORM_9757_TIRTOP_3.DAT
$ touch XOPX.DAT
$ touch X.DAT
$ ls
FORM_9757_TIRTOP_3.DAT  FORM_9840_OPRTOP_2.DAT  XOPX.DAT
FORM_9757_TYUIOP_1.DAT  X.DAT
$ ls ??????????????OP??????
FORM_9757_TIRTOP_3.DAT  FORM_9757_TYUIOP_1.DAT  FORM_9840_OPRTOP_2.DAT

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rac
# 3  
Old 08-07-2015
with command find

Code:
find pathOfYourFolder  -name "*OP*"

# 4  
Old 08-07-2015
Instead of * which matches zero or more of any character, you could use ? to indicate a single character, so:-
Code:
ls *Hello*.txt
ls ??????Hello???.txt

The first will match any files that has Hello anywhere in the name and finishes with .txt where the second option will only match files that have Hello from character 7, then any three characters and ending .txt

If your current directory has the following files:-
Code:
Hello.txt
Hello-me.txt
123Hello.txt
123456Hello123.txt

.... The first command will match all files, but the second will only match the last file.

You can use this as a file name mask for find too, e.g.
Code:
find /your/path -name "??????Hello???.txt"



I hope that this helps,
Robin
This User Gave Thanks to rbatte1 For This Post:
rac
# 5  
Old 08-07-2015
You could also use the underscores as markers:
Code:
ls *_*_*OP_*.DAT

Although a bit less exact, it will probably get you what you want..
This User Gave Thanks to Scrutinizer For This Post:
rac
# 6  
Old 08-07-2015
The unquoted glob-expression is evaluated by the shell, so you can as well do
Code:
echo ????_????_????OP_?????

ls -1 (or ls if not seeing an interactive terminal) puts output line by line, that is sometimes convenient. Like the following that pipes the output to grep
Code:
ls -1 | grep '^...._...._....OP_.....$'

grep uses Regular Expression: . is a single character, ^ is line start, $ is line end.
This User Gave Thanks to MadeInGermany For This Post:
rac
# 7  
Old 08-07-2015
Quote:
The file name format is fixed.
Code:
ls FORM_[0-9][0-9][0-9][0-9]_[A-Z][A-Z][A-Z][A-Z]OP_?.DAT

or
Code:
ls FORM_[0-9][0-9][0-9][0-9]_[A-Z][A-Z][A-Z][A-Z]OP_[0-9].DAT

This User Gave Thanks to Aia For This Post:
rac
 
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