Login or Register to Ask a Question and Join Our Community


Shell Programming and Scripting

Need a little explanation of "\..\{3\}$"

Login to Discuss or Reply to this Discussion in Our Community

 
Thread Tools Search this Thread
Top Forums Shell Programming and Scripting Need a little explanation of "\..\{3\}$"
# 1  
Old 01-04-2012
Question Need a little explanation of "\..\{3\}$"
Hey,

I have used the following to remove the extension/prefix from a file name:
Code:
file_name=$1
file_title=`echo $1|sed 's/\..\{3\}$//'`

It works perfectly but I am looking for an explanation to what "\..\{3\}$" actually does. If someone could break it down and explain what each piece does I will be very grateful Smilie


Moderator's Comments:
Mod Comment How to use code tags
Last edited by Franklin52; 01-04-2012 at 07:33 AM.. Reason: Please use code tags for code and data samples, thank you
# 2  
Old 01-04-2012
\..\{3\}$ =>
\. --> Explicitly mentioning shell to match dot
. --> matches any single character except newline
\{3\} --> match 3 numbers of previously mentioned character. So, .\{3\} will match exactly 3 characters
$ --> match pattern found at end of string.

So, to summarize this: match exactly any 3 characters after a dot.
This User Gave Thanks to balajesuri For This Post:
Dude92
Login or Register to Ask a Question

Previous Thread | Next Thread

9 More Discussions You Might Find Interesting

1. AIX

Apache 2.4 directory cannot display "Last modified" "Size" "Description"

Hi 2 all, i have had AIX 7.2 :/# /usr/IBMAHS/bin/apachectl -v Server version: Apache/2.4.12 (Unix) Server built: May 25 2015 04:58:27 :/#:/# /usr/IBMAHS/bin/apachectl -M Loaded Modules: core_module (static) so_module (static) http_module (static) mpm_worker_module (static) ... (3 Replies)
Discussion started by: penchev
3 Replies

2. UNIX for Beginners Questions & Answers

Explanation around "+r" in egrep

Hi, Is anyone able to shed some light on "+r"? I know -r in grep refers to a recursive search - I am curious to know what +r specifies. #show process pidin | utility egrep -e "+r" count 2492 Thanks. (3 Replies)
Discussion started by: sand1234
3 Replies

3. Shell Programming and Scripting

Bash script - Print an ascii file using specific font "Latin Modern Mono 12" "regular" "9"

Hello. System : opensuse leap 42.3 I have a bash script that build a text file. I would like the last command doing : print_cmd -o page-left=43 -o page-right=22 -o page-top=28 -o page-bottom=43 -o font=LatinModernMono12:regular:9 some_file.txt where : print_cmd ::= some printing... (1 Reply)
Discussion started by: jcdole
1 Replies

4. UNIX for Dummies Questions & Answers

Using "mailx" command to read "to" and "cc" email addreses from input file

How to use "mailx" command to do e-mail reading the input file containing email address, where column 1 has name and column 2 containing “To” e-mail address and column 3 contains “cc” e-mail address to include with same email. Sample input file, email.txt Below is an sample code where... (2 Replies)
Discussion started by: asjaiswal
2 Replies

5. UNIX for Dummies Questions & Answers

Explanation on problem "match" function awk

Hello Unix experts, If I could get any explanations on why the code below doesn't work it would be great ! My input looks like that ("|" delimited): Saaaaabbbbbccccc|ok Sdddddfffffggggg|ok The goal is, if $2 is "ok", to remove everything before the pattern given in the match function... (5 Replies)
Discussion started by: lucasvs
5 Replies

6. Shell Programming and Scripting

awk command to replace ";" with "|" and ""|" at diferent places in line of file

Hi, I have line in input file as below: 3G_CENTRAL;INDONESIA_(M)_TELKOMSEL;SPECIAL_WORLD_GRP_7_FA_2_TELKOMSEL My expected output for line in the file must be : "1-Radon1-cMOC_deg"|"LDIndex"|"3G_CENTRAL|INDONESIA_(M)_TELKOMSEL"|LAST|"SPECIAL_WORLD_GRP_7_FA_2_TELKOMSEL" Can someone... (7 Replies)
Discussion started by: shis100
7 Replies

7. UNIX for Dummies Questions & Answers

Explanation of "total" field in "ls -l" command output

When I do a listing in one particular directory (ls -al) I get: total 43456 drwxrwxrwx 2 root root 4096 drwxrwxrwx 3 root root 4096 -rwxrwxr-x 1 nobody nobody 3701594 -rwxrwxr-x 1 nobody nobody 3108510 -rwxrwxr-x 1 nobody nobody 3070580 -rwxrwxr-x 1 nobody nobody 3099733 -rwxrwxr-x 1... (1 Reply)
Discussion started by: proactiveaditya
1 Replies

8. UNIX for Dummies Questions & Answers

explanation for "if [ -s $filename ];"

Hi all, Can any one explain me what the below 'if' statement checking for? if ; then do something fi Iam aware of the remaining options like -z, -r, -w, -x etc., with 'if' statement, but I dont know about '-s' :confused:. Thanks in advance, Mysore 101 Ganapati. (4 Replies)
Discussion started by: ganapati
4 Replies

9. UNIX for Dummies Questions & Answers

Explain the line "mn_code=`env|grep "..mn"|awk -F"=" '{print $2}'`"

Hi Friends, Can any of you explain me about the below line of code? mn_code=`env|grep "..mn"|awk -F"=" '{print $2}'` Im not able to understand, what exactly it is doing :confused: Any help would be useful for me. Lokesha (4 Replies)
Discussion started by: Lokesha
4 Replies
Login or Register to Ask a Question