Sponsored Content
Top Forums Shell Programming and Scripting How to start reading from the nth line till the last line of a file. Post 302592268 by methyl on Monday 23rd of January 2012 11:11:16 AM
Old 01-23-2012
Much faster with "sed". Also by using "while read" rather than "for" we preserve each record intact:
Code:
sed -n '2,$ p' test.txt | while read line
do
         echo "${line}"
done

Note the double quotes round the string variable $line.
This User Gave Thanks to methyl For This Post:
 

9 More Discussions You Might Find Interesting

1. Shell Programming and Scripting

Reading a file line by line and processing for each line

Hi, I am a beginner in shell scripting. I have written the following script, which is supposed to process the while loop for each line in the sid_home.txt file. But I'm getting the 'end of file' unexpected for the last line. The file sid_home.txt gets generated as expected, but the script... (6 Replies)
Discussion started by: sagarparadkar
6 Replies

2. Shell Programming and Scripting

[Solved] Problem in reading a file line by line till it reaches a white line

So, I want to read line-by-line a text file with unknown number of files.... So: a=1 b=1 while ; do b=`sed -n '$ap' test` a=`expr $a + 1` $here do something with b etc done the problem is that sed does not seem to recognise the $a, even when trying sed -n ' $a p' So, I cannot read... (3 Replies)
Discussion started by: hakermania
3 Replies

3. Shell Programming and Scripting

Reading a file after nth line

I know how to read a file line by line. But don't to how to skip to a line matching a criteria and then continue reading it till the end. This is a log file. The input is a timestamp. 1. Find the timestamp in the log file 2. Read the remaining lines one at a time till EOF. How can I do... (9 Replies)
Discussion started by: avinthm
9 Replies

4. Shell Programming and Scripting

Reading text file, comparing a value in a line, and placing only part of the line in a variable?

I need some help. I would like to read in a text file. Take a variable such as ROW-D-01, compare it to what's in one line in the text file such as PROD/VM/ROW-D-01 and only input PROD/VM into a variable without the /ROW-D-01. Is this possible? any help is appreciated. (2 Replies)
Discussion started by: xChristopher
2 Replies

5. Shell Programming and Scripting

Reading line by line from live log file using while loop and considering only those lines start from

Hi, I want to read a live log file line by line and considering those line which start from time stamp; Below code I am using, which read line but throws an exception when comparing line that does not contain error code tail -F /logs/COMMON-ERROR.log | while read myline; do... (2 Replies)
Discussion started by: ketanraut
2 Replies

6. Shell Programming and Scripting

Bash script to read a file from particular line till required line and process

Hi All, Am trying to write wrapper shell/bash script on a utility tool for which i need to pass 2 files as arugment to execute utility tool. Wraper script am trying is to do with above metion 2 files. utility tool accepts : a. userinfo file : which contains username b. item file : which... (2 Replies)
Discussion started by: Optimus81
2 Replies

7. UNIX for Beginners Questions & Answers

Insert a line of text on nth line of a file

Hi All, I am using UNix Sun OS sun4u sparc SUNW,SPARC-Enterprise My intention is to insert a line of text after 13th line of every file inside a particular directory. While trying to do it for a single file , i am using sed sed '3 i this is the 4th line' filename sed: command garbled: 3... (5 Replies)
Discussion started by: gotamp
5 Replies

8. Shell Programming and Scripting

Printing string from last field of the nth line of file to start (or end) of each line (awk I think)

My file (the output of an experiment) starts off looking like this, _____________________________________________________________ Subjects incorporated to date: 001 Data file started on machine PKSHS260-05CP ********************************************************************** Subject 1,... (9 Replies)
Discussion started by: samonl
9 Replies

9. UNIX for Beginners Questions & Answers

Reading a file line by line and print required lines based on pattern

Hi All, i want to write a shell script read below file line by line and want to exclude the lines which contains empty value for MOUNTPOINT field. i am using centos 7 Operating system. want to read below file. # cat /tmp/d5 NAME="/dev/sda" TYPE="disk" SIZE="60G" OWNER="root"... (4 Replies)
Discussion started by: balu1234
4 Replies
MEMORY_PRESSURE(1)					    BSD General Commands Manual 					MEMORY_PRESSURE(1)

NAME
memory_pressure -- Tool to apply real or simulate memory pressure on the system. SYNOPSIS
memory_pressure [-l level] | [-p percent_free] | [-S -l level] OPTIONS
-l <level> Apply real or simulate memory pressure (if specified alongside simulate argument) on the system till low memory notifications cor- responding to <level> are generated. Supported values are "warn" and "critical". -p <percent_free> Allocate memory till the available memory in the system is <percent_free> of total memory. If the percentage of available memory to total memory on the system drops, the tool will free memory till either the desired percentage is achieved or it runs out of memory to free. -S Simulate memory pressure on the system by placing it artificially for <sleep_seconds> duration at the "warn" or "critical" level. -s <sleep_seconds> Duration to wait before allocating or freeing memory if applying real pressure. In case of simulating memory pressure, this is the duration the system will be maintained at an artifical memory level. DESCRIPTION
A tool to apply real or simulate memory pressure on the system SEE ALSO
vm_stat(1) Mac OS X Mar 7, 2013 Mac OS X
All times are GMT -4. The time now is 05:02 AM.
Unix & Linux Forums Content Copyright 1993-2022. All Rights Reserved.
Privacy Policy