Sponsored Content
Top Forums Shell Programming and Scripting reading each line from a file Post 302114300 by cfajohnson on Friday 13th of April 2007 08:25:20 PM
Old 04-13-2007
Quote:
Originally Posted by Shell_Life
ragha81,
Here is one way of looping thru a file:
Code:
while read EachLine
do
   echo $EachLine
done < input_file


That script will strip leading and trailing spaces from the lines, and will treat backslashes as escape characters.

To prevent stripping spaces, set IFS to an empty string.

To prevent backslash interpretation, use the -r option:

Code:
while IFS= read -r EachLine

 

9 More Discussions You Might Find Interesting

1. Shell Programming and Scripting

KSH: Reading a file line by line into multiple arrays

Hi - I have a file that contains data in this format:- #comment value1 value2 value3 #comment value4 value5 value6 value7 #comment value8 value9 I need to read value1, value2 and value3 into one array, value4 value5 value6 and value7 into another array and value8 and value9 into a 3rd... (2 Replies)
Discussion started by: sniper57
2 Replies

2. Shell Programming and Scripting

reading a file inside awk and processing line by line

Hi Sorry to multipost. I am opening the new thread because the earlier threads head was misleading to my current doubt. and i am stuck. list=`cat /u/Test/programs`; psg "ServTest" | awk -v listawk=$list '{ cmd_name=($5 ~ /^/)? $9:$8 for(pgmname in listawk) ... (6 Replies)
Discussion started by: Anteus
6 Replies

3. 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

4. UNIX for Dummies Questions & Answers

Parsing file, reading each line to variable, evaluating date/time stamp of each line

So, the beginning of my script will cat & grep a file with the output directed to a new file. The data I have in this file needs to be parsed, read and evaluated. Basically, I need to identify the latest date/time stamp and then calculate whether or not it is within 15 minutes of the current... (1 Reply)
Discussion started by: hynesward
1 Replies

5. Shell Programming and Scripting

How to start reading from the nth line till the last line of a file.

Hi, For my reuirement, I have to read a file from the 2nd line till the last line<EOF>. Say, I have a file as test.txt, which as a header record in the first line followed by records in rest of the lines. for i in `cat test.txt` { echo $i } While doing the above loop, I have read... (5 Replies)
Discussion started by: machomaddy
5 Replies

6. 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

7. Shell Programming and Scripting

Comparison of fields then increment a counter reading line by line in a file

Hi, i have a scenario were i should compare a few fields from each line then increment a variable based on that. Example file 989878|8999|Y|0|Y|N|V 989878|8999|Y|0|N|N|V 989878|8999|Y|2344|Y|N|V i have 3 conditions to check and increment a variable on every line condition 1 if ( $3... (4 Replies)
Discussion started by: selvankj
4 Replies

8. 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

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
iterator_info_s(3snmp)						     net-snmp						    iterator_info_s(3snmp)

NAME
iterator_info_s - Holds iterator information containing functions which should be called by the iterator_handler to loop over your data set and sort it in a SNMP specific manner. SYNOPSIS
Data Fields netsnmp_container c Netsnmp_Iterator_Loop_Key * get_first Netsnmp_Iterator_Loop_Key * get_next Netsnmp_Iterator_Loop_Data * get_data Netsnmp_Iterator_Data * free_user_ctx Netsnmp_Iterator_Ctx * init_loop_ctx Netsnmp_Iterator_Ctx * cleanup_loop_ctx Netsnmp_Iterator_Ctx_Dup * save_pos Netsnmp_Iterator_Data * release_data Netsnmp_Iterator_Data * insert_data Netsnmp_Iterator_Data * remove_data Netsnmp_Iterator_Op * get_size int sorted void * user_ctx This can be used by client handlers to store any information they need. Detailed Description Holds iterator information containing functions which should be called by the iterator_handler to loop over your data set and sort it in a SNMP specific manner. The iterator_info typedef can be used instead of directly calling this struct if you would prefer. Definition at line 39 of file container_iterator.c. Field Documentation void* iterator_info_s::user_ctx This can be used by client handlers to store any information they need. Definition at line 69 of file container_iterator.c. Author Generated automatically by Doxygen for net-snmp from the source code. Version 5.4.3.pre1 23 May 2010 iterator_info_s(3snmp)
All times are GMT -4. The time now is 06:16 PM.
Unix & Linux Forums Content Copyright 1993-2022. All Rights Reserved.
Privacy Policy