Sponsored Content
Full Discussion: command line explanation
Top Forums Shell Programming and Scripting command line explanation Post 302277398 by goude on Friday 16th of January 2009 08:07:35 AM
Old 01-16-2009
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 file so that you can process it.
i.bak creates a back up file
-w turns on warnings.
-e is the script you want to execute.

Does anyone know what s/\z/ is for?

Thanks a lot.
 

10 More Discussions You Might Find Interesting

1. Shell Programming and Scripting

explanation of this line

Hi Gurus, sqlplus system @$1 0</opt/oracle/pwdfile What would be the output of the above life....the password for the user "system" the user is stored in /opt/oracle/pwdfile When i try to run the script it says password not found? $1 0< What is the meaning of the $1 and 0? ... (1 Reply)
Discussion started by: castlerock
1 Replies

2. 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

3. Shell Programming and Scripting

explanation for this line

Hi All, can you please explain me the meaning of this line-- BackupLocation="/inpass/abc" Parent=$(expr $BackupLocation : '\(.*\)/.*' \| $BackupLocation) when i ran this as a command also it did not show me anything so could not get the purpose of this line. Explain it please. (3 Replies)
Discussion started by: namishtiwari
3 Replies

4. 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

5. 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

6. UNIX for Advanced & Expert Users

command explanation

can anyone please tell me what does this expression means , i am under probation and need some explanation :) $AUDIT_DIR -type f -mtime +$AUDIT_EXPIRE \ -exec rm {} > /dev/null 2>&1 \; AUDIT_DIR="/var/log/" AUDIT_EXPIRE='30' Please use code tags! (4 Replies)
Discussion started by: semaan
4 Replies

7. 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

8. 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

9. 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

10. 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
XML_PP(1)						User Contributed Perl Documentation						 XML_PP(1)

NAME
xml_pp - xml pretty-printer SYNOPSYS
xml_pp [options] [<files>] DESCRIPTION
XML pretty printer using XML::Twig OPTIONS
-i[<extension>] edits the file(s) in place, if an extension is provided (no space between "-i" and the extension) then the original file is backed-up with that extension The rules for the extension are the same as Perl's (see perldoc perlrun): if the extension includes no "*" then it is appended to the original file name, If the extension does contain one or more "*" characters, then each "*" is replaced with the current filename. -s <style> the style to use for pretty printing: none, nsgmls, nice, indented, record, or record_c (see XML::Twig docs for the exact description of those styles), 'indented' by default -p <tag(s)> preserves white spaces in tags. You can use several "-p" options or quote the tags if you need more than one -e <encoding> use XML::Twig output_encoding (based on Text::Iconv or Unicode::Map8 and Unicode::String) to set the output encoding. By default the original encoding is preserved. If this option is used the XML declaration is updated (and created if there was none). Make sure that the encoding is supported by the parser you use if you want to be able to process the pretty_printed file (XML::Parser does not support 'latin1' for example, you have to use 'iso-8859-1') -l loads the documents in memory instead of outputing them as they are being parsed. This prevents a bug (see BUGS) but uses more memory -f <file> read the list of files to process from <file>, one per line -v verbose (list the current file being processed) -- stop argument processing (to process files that start with -) -h display help EXAMPLES
xml_pp foo.xml > foo_pp.xml # pretty print foo.xml xml_pp < foo.xml > foo_pp.xml # pretty print from standard input xml_pp -v -i.bak *.xml # pretty print .xml files, with backups xml_pp -v -i'orig_*' *.xml # backups are named orig_<filename> xml_pp -i -p pre foo.xhtml # preserve spaces in pre tags xml_pp -i.bak -p 'pre code' foo.xml # preserve spaces in pre and code tags xml_pp -i.bak -p pre -p code foo.xml # same xml_pp -i -s record mydb_export.xml # pretty print using the record style xml_pp -e utf8 -i foo.xml # output will be in utf8 xml_pp -e iso-8859-1 -i foo.xml # output will be in iso-8859-1 xml_pp -v -i.bak -f lof # pretty print in place files from lof xml_pp -- -i.xml # pretty print the -i.xml file xml_pp -l foo.xml # loads the entire file in memory # before pretty printing it xml_pp -h # display help BUGS
Elements with mixed content that start with an embedded element get an extra <elt><b>b</b>toto<b>bold</b></elt> will be output as <elt> <b>b</b>toto<b>bold</b></elt> Using the "-l" option solves this bug (but uses more memory) TODO
update XML::Twig to use Encode with perl 5.8.0 AUTHOR
Michel Rodriguez <mirod@xmltwig.com> perl v5.16.3 2012-11-14 XML_PP(1)
All times are GMT -4. The time now is 09:06 AM.
Unix & Linux Forums Content Copyright 1993-2022. All Rights Reserved.
Privacy Policy