Login or Register to Ask a Question and Join Our Community


UNIX for Advanced & Expert Users

command explanation

Login to Discuss or Reply to this Discussion in Our Community

 
Thread Tools Search this Thread
Top Forums UNIX for Advanced & Expert Users command explanation
# 1  
Old 09-15-2011
command explanation
can anyone please tell me what does this expression means , i am under probation and need some explanation Smilie

Code:
$AUDIT_DIR -type f -mtime +$AUDIT_EXPIRE \ -exec rm {} > /dev/null 2>&1 \;
 
 
AUDIT_DIR="/var/log/"
AUDIT_EXPIRE='30'


Moderator's Comments:
Mod Comment Please use code tags!
# 2  
Old 09-15-2011
command will find and remove the files which are older than 30 days in /var/log path
# 3  
Old 09-15-2011
thanks a lot Smilie

---------- Post updated at 05:28 PM ---------- Previous update was at 05:12 PM ----------
is the right format could be written like that:
Code:
/usr/bin/find . $AUDIT_DIR -type f -mtime +$AUDIT_EXPIRE | -exec rm {} > /dev/null 2>&1

or
Code:
/usr/bin/find . $AUDIT_DIR -type f -mtime +$AUDIT_EXPIRE \ -exec rm {} > /dev/null 2>&1 \

please can i have explanation for the one that is true ? :$ sorry for tking of ur time


Moderator's Comments:
Mod Comment Please use [code] and [/code] tags when posting code, data or logs etc. to preserve formatting and enhance readability, thanks. Also refrain from overly use of font formattings as it makes it awful to edit a post, thanks! Check your PM about code tags, thanks.
Last edited by zaxxon; 09-15-2011 at 09:38 AM.. Reason: code tags, see PM
# 4  
Old 09-16-2011
Neither | nor \ make much sense there. I don't think it has any purpose at all at present, and would prevent it from working.

I suspect it was originally this:
Code:
/usr/bin/find . $AUDIT_DIR -type f -mtime +$AUDIT_EXPIRE \
        -exec rm {} > /dev/null 2>&1

The backslash at the end of the first line makes the shell interpret both as one longer line. This is often used to wrap long lines of code so they're not wider than your editor.
# 5  
Old 09-19-2011
thanks a lot corona688 for the tips Smilie , it was really helpful Smilie

regards
Login or Register to Ask a Question

Previous Thread | Next Thread

10 More Discussions You Might Find Interesting

1. UNIX for Beginners Questions & Answers

Explanation of Nawk command

Hi Folks, I am struggling to understand nawk command which was used by another developer. Can you please explain what each character or string is doing here below: if ; then (3 Replies)
Discussion started by: kirans.229
3 Replies

2. Shell Programming and Scripting

sed command explanation

Will someone give me an explanation on how the sed command below works. sed 's/.*//' Thanks! (3 Replies)
Discussion started by: scj2012
3 Replies

3. UNIX for Dummies Questions & Answers

Explanation of the sort command

Hi everyone, I am wondering if someone could please break down and explain the following sort command for me: ls ${DEST_LOCATION}/${FILES} | sort -rt -k 4,4n | head -1 I have tried working it out using 'man sort', but on AIX there is not a great explanation of this function. I know that... (9 Replies)
Discussion started by: jimbojames
9 Replies

4. Shell Programming and Scripting

Logic Explanation of Match command in Linux

I am debugging a script and have stuck up at one code line awk -F , '{if (match($3,001)) { print $2 } }' Master20120307090511.tmp The Master20120307090511.tmp is 001,ARE , 001 002,ARE , 002 003,ARE , 003 006,ARE , 006 011,ARE , 011 012,ARE , 012 What happens is when i fire this ... (5 Replies)
Discussion started by: vee_789
5 Replies

5. Shell Programming and Scripting

Need explanation a of command in linux

Hi All I ran a script in Linux. In the script i have lines like && echo "Failed: Missing ${CM_ENV_FILE} \n" && return 1 . ${CM_ENV_FILE} Where CM_ENV_FILE = /data/ds/dpr_ebicm_uat//etl/cm3_0/entities/BBME/parameters/cm.env But its taking this path... (1 Reply)
Discussion started by: vee_789
1 Replies

6. Shell Programming and Scripting

sed sorting command explanation

sed '$!N; /^\(.*\)\n\1$/!P; D' i found this file which removes duplicates irrespective for sorted or unsorted file. keep first occurance and remove the further occurances. can any1 explain how this is working.. i need to remove duplicates following file. duplicate criteria is not the... (3 Replies)
Discussion started by: mukeshguliao
3 Replies

7. UNIX for Dummies Questions & Answers

Explanation of the command sed -n -e 's_.*>\(.*\)<.*_\1_p' filename.xml

Hi Friends, I am trying to modify a script .The script contains this line: sed -n -e 's_.*>\(.*\)<.*_\1_p' filename.xml I am not great in sed command.I know, it is regular expression to match a pattern string that starts with s_ and ends with 1_.I doesnot give the desired result. Can... (4 Replies)
Discussion started by: rajsharma
4 Replies

8. UNIX for Dummies Questions & Answers

SED command explanation

can someone please explain the below sed command.. sed 's/\(*|\)\(.*\)/\2\1/' (6 Replies)
Discussion started by: raghu_shekar
6 Replies

9. Shell Programming and Scripting

command line explanation

Hello everyone, I found this command line in a website: perl -pi.bak -we's/\z/Your new line\n/ if $. == 2;' your_text_file.txt With this command line you can insert a new line anywhere you want in a text without overwriting what's in it. -p causes perl to assume a loop around your... (4 Replies)
Discussion started by: goude
4 Replies

10. Shell Programming and Scripting

sed command explanation needed

Hi, Could you please explain me the below statement -- phrase wise. sed -e :a -e '$q;N;'$cnt',$D;ba' abc.txt > xyz.txt if suppose $cnt contains value: 10 it copies last 9 lines of abc.txt to xyz.txt why it is copying last 9 rather than 10. and also what is ba and $D over there in... (4 Replies)
Discussion started by: subbukns
4 Replies
Login or Register to Ask a Question