Login or Register to Ask a Question and Join Our Community

Sponsored Content
Full Discussion: Using sed, awk or perl to remove substring of all lines except the first
Top Forums Shell Programming and Scripting Using sed, awk or perl to remove substring of all lines except the first Post 302809347 by Don Cragun on Sunday 19th of May 2013 12:38:21 PM
Old 05-19-2013
Quote:
Originally Posted by jacksolm
Now, I see the missing piece. I was missing the algorithm to remove an item from the middle of an array. In other words:

To delete an element from the middle of an array:

Code:
1. There is no need to do anything with the element deleted.
2. Iterate along the array from 1 after the deleted element, to the last element.
3. Copy each element into the location 1 before it.
4. Set the last element to null.

Thanks again for sharing your knowledge and expertise!
You're welcome. You almost described what the script is doing. Rather than setting the last element to null, the script I provided just reduces the number of elements to be processed in the array (that is what the n-- does). The former last element is still there unchanged, but it will be ignored when updating the last field just before printing the modified line. (Note that all of the elements in the array will be deleted and replaced with new elements the next time split() is called when awk is processing the next line.)
 

10 More Discussions You Might Find Interesting

1. Shell Programming and Scripting

Sed or Awk to remove specific lines

I have searched the forum for this - forgive me if I missed a previous post. I have the following file: blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah alter table "informix".esc_acct add constraint (foreign key (fi_id) references "informix".fi ... (5 Replies)
Discussion started by: Shoeless_Mike
5 Replies

2. Shell Programming and Scripting

How to remove lines before and after with awk / sed ?

Hi guys, I need to remove the pattern (ID=180), one line before and four lines after. Thanks. (5 Replies)
Discussion started by: ashimada
5 Replies

3. Shell Programming and Scripting

perl or awk remove empty lines when condition

Hi Everyone, # cat 1 a b b cc 1 2 3 3 3 4 55 5 a b (2 Replies)
Discussion started by: jimmy_y
2 Replies

4. Shell Programming and Scripting

How to remove spaces using awk,sed,perl?

Input: 3456 565 656 878 235 8 4 8787 3 7 35 878 Expected output: 3456 565 656 878 235 8 4 8787 3 7 35 878 How can i do this with awk,sed and perl? (10 Replies)
Discussion started by: cola
10 Replies

5. Shell Programming and Scripting

Command to remove duplicate lines with perl,sed,awk

Input: hello hello hello hello monkey donkey hello hello drink dance drink Output should be: hello hello monkey donkey drink dance (9 Replies)
Discussion started by: cola
9 Replies

6. Shell Programming and Scripting

Need an awk / sed / or perl one-liner to remove last 4 characters with non-unique pattern.

Hi, I'm writing a ksh script and trying to use an awk / sed / or perl one-liner to remove the last 4 characters of a line in a file if it begins with a period. Here is the contents of the file... the column in which I want to remove the last 4 characters is the last column. ($6 in awk). I've... (10 Replies)
Discussion started by: right_coaster
10 Replies

7. Shell Programming and Scripting

Process alternate lines in awk/sed/perl

hi.. i have a fasta file with the following format >sequence1 CCGGTTTTCGATTTGGTTTGACT >sequence2 AAAGTGCCGCCAGGTTTTGAGTGT >sequence3 AGTGCCGCAGAGTTTGTAGTGT Now, i want to read alternate line and add "GGGGGGGGGGG" to end of every sequence Desired output: >sequence1... (4 Replies)
Discussion started by: empyrean
4 Replies

8. Shell Programming and Scripting

Sed/awk/perl substitution with multiple lines

OSX I have been grinding my teeth on a portion of code. I am building a bash script that edits a html email template. In the template, I have place holders for SED (or whatever program is appropriate) to use as anchors for find and replace, with user defined corresponding html code. The HTML code... (3 Replies)
Discussion started by: sudo
3 Replies

9. Shell Programming and Scripting

Remove lines matching a substring in a specific column

Dear group, I have following input text file: Brit 2016 11 18 12 00 10 1.485,00 EUR Brit 2016 11 18 12 00 10 142,64 EUR Brit 2016 11 18 12 00 10 19,80 EUR Brit 2016 11 18 12 00 10 545,00 EUR Brit 2016 11 18 12 00 10 6.450,00 EUR... (3 Replies)
Discussion started by: gfhsd
3 Replies

10. UNIX for Beginners Questions & Answers

awk with sed to combine lines and remove specific odd # pattern from line

In the awk piped to sed below I am trying to format file by removing the odd xxxx_digits and whitespace after, then move the even xxxx_digit to the line above it and add a space between them. There may be multiple lines in file but they are in the same format. The Filename_ID line is the last line... (4 Replies)
Discussion started by: cmccabe
4 Replies

LEARN ABOUT DEBIAN

smpteframe

SMPTEFrame(3)							    libltcsmpte 						     SMPTEFrame(3)

NAME

       SMPTEFrame -

       Raw 80 bit SMPTE frame.

SYNOPSIS

       #include <ltcsmpte.h>

   Data Fields
       unsigned int frameUnits:4
       unsigned int user1:4
       unsigned int frameTens:2
       unsigned int dfbit:1
       unsigned int colFrm:1
       unsigned int user2:4
       unsigned int secsUnits:4
       unsigned int user3:4
       unsigned int secsTens:3
       unsigned int biphaseMarkPhaseCorrection:1
       unsigned int user4:4
       unsigned int minsUnits:4
       unsigned int user5:4
       unsigned int minsTens:3
       unsigned int binaryGroupFlagBit1:1
       unsigned int user6:4
       unsigned int hoursUnits:4
       unsigned int user7:4
       unsigned int hoursTens:2
       unsigned int reserved:1
       unsigned int binaryGroupFlagBit2:1
       unsigned int user8:4
       unsigned int syncWord:16

Detailed Description
       Raw 80 bit SMPTE frame.

       Definition at line 140 of file ltcsmpte.h.

Field Documentation
   unsigned int SMPTEFrame::binaryGroupFlagBit1
       Definition at line 160 of file ltcsmpte.h.

   unsigned int SMPTEFrame::binaryGroupFlagBit2
       Definition at line 168 of file ltcsmpte.h.

   unsigned int SMPTEFrame::biphaseMarkPhaseCorrection
       Definition at line 153 of file ltcsmpte.h.

   unsigned int SMPTEFrame::colFrm
       Definition at line 146 of file ltcsmpte.h.

   unsigned int SMPTEFrame::dfbit
       Examples:
	   tests/decoder.c.

       Definition at line 145 of file ltcsmpte.h.

   unsigned int SMPTEFrame::frameTens
       Definition at line 144 of file ltcsmpte.h.

   unsigned int SMPTEFrame::frameUnits
       Definition at line 141 of file ltcsmpte.h.

   unsigned int SMPTEFrame::hoursTens
       Definition at line 166 of file ltcsmpte.h.

   unsigned int SMPTEFrame::hoursUnits
       Definition at line 163 of file ltcsmpte.h.

   unsigned int SMPTEFrame::minsTens
       Definition at line 159 of file ltcsmpte.h.

   unsigned int SMPTEFrame::minsUnits
       Definition at line 156 of file ltcsmpte.h.

   unsigned int SMPTEFrame::reserved
       Definition at line 167 of file ltcsmpte.h.

   unsigned int SMPTEFrame::secsTens
       Definition at line 152 of file ltcsmpte.h.

   unsigned int SMPTEFrame::secsUnits
       Definition at line 149 of file ltcsmpte.h.

   unsigned int SMPTEFrame::syncWord
       Definition at line 171 of file ltcsmpte.h.

   unsigned int SMPTEFrame::user1
       Definition at line 142 of file ltcsmpte.h.

   unsigned int SMPTEFrame::user2
       Definition at line 147 of file ltcsmpte.h.

   unsigned int SMPTEFrame::user3
       Definition at line 150 of file ltcsmpte.h.

   unsigned int SMPTEFrame::user4
       Definition at line 154 of file ltcsmpte.h.

   unsigned int SMPTEFrame::user5
       Definition at line 157 of file ltcsmpte.h.

   unsigned int SMPTEFrame::user6
       Definition at line 161 of file ltcsmpte.h.

   unsigned int SMPTEFrame::user7
       Definition at line 164 of file ltcsmpte.h.

   unsigned int SMPTEFrame::user8
       Definition at line 169 of file ltcsmpte.h.

Author
       Generated automatically by Doxygen for libltcsmpte from the source code.

Version 0.4.4							  Fri Apr 27 2012						     SMPTEFrame(3)
All times are GMT -4. The time now is 05:30 AM.
Unix & Linux Forums Content Copyright 1993-2022. All Rights Reserved.
Privacy Policy