File handling


 
Thread Tools Search this Thread
Top Forums UNIX for Dummies Questions & Answers File handling
# 1  
Old 08-11-2013
File handling

I have a file
Code:
1
298167
298168
1093209
1093210
1422663

I want to write a code where in I want to read contents of above file
like first read is 1
second read is 298167

Substract second read from first and if this is greater than or less than 99,999.

Similarly I want to traverse thru the whole file

Contents are always sorted. Values are random
it can be
Code:
1
100
99999
198591


Last edited by Scott; 08-11-2013 at 12:49 PM.. Reason: Code tags
# 2  
Old 08-11-2013
What did you attempt so far?
# 3  
Old 08-11-2013
I think I made almost everything.. but I need a small help

I want to exit a loop without using exit. I mean I dont want the program to end. Just end of loop is some condition is reached.

Please note below code has a lot more logic than mention in my query above.

#!/bin/sh
file="drop/test1"
blk_val=99999
while read j
do
prev=$j
prev1=$j
blk_flag=0
loop_count=0
blk_size=0
while read j
do
if [ ${j} -gt ${prev} ]; then
next=$j
blk_size=`expr $next - $prev + $blk_size + 1 `
if [ ${blk_size} -ge ${blk_val} ]; then
if [ ${blk_flag} -eq 1 ]; then
if [ ${loop_count} -eq 0 ]; then
header=$prev1
trailer=$next
prev=`expr $next + 1`
echo h0=$header
echo t0=$trailer
blk_size=0
blk_flag=0
loop_count=1
prev1=`expr $trailer + 1`
else
prev1=`expr $trailer + 1`
trailer=$next
prev=`expr $next + 1`
header=$prev1
echo h1=$header
echo t1=$trailer
blk_size=0
blk_flag=0
fi
else
header=$prev
trailer=$next
prev=`expr $next + 1`
blk_size=0
echo h2=$header
echo t2=$trailer
fi
else
prev=`expr $next + 1`
blk_flag=1
fi
fi
done < $file
echo h3=$header
echo t3=$trailer
done < $file

Last edited by Scott; 08-11-2013 at 08:26 PM.. Reason: Returning user, previously banned. Thread closed.
# 4  
Old 08-11-2013
Please use code tags as required by forum rules!

What about using the break command?
 
Login or Register to Ask a Question

Previous Thread | Next Thread

10 More Discussions You Might Find Interesting

1. Shell Programming and Scripting

File handling

Hi All, I need to extract the data from the text file. The data of the text file is shown below #L 0.000017 4.329939 0.000017 4.716267 r7.9 P 1 1;Net=IN32 The extracted data should be IN32. Could anyone help to script in c shell.? (4 Replies)
Discussion started by: gopishrine
4 Replies

2. UNIX for Dummies Questions & Answers

File Handling

Hi Team, I am trying to cut a large file into multiple files. It has Header 50,050 records Trailer ------------------------------------------- I need to cut the files into multiple files of 1000 records and should have the same header and trailer as the original files. ... (4 Replies)
Discussion started by: Gurkamal83
4 Replies

3. Shell Programming and Scripting

ksh file handling

Specifically on RHEL 5.7. When does the underlying ksh process open and close files? Every time they're accessed, or as little as possible? Say you have some script like: CreateFiles() { grep "<VALUE1>" ${infile} >> ${outfile} grep "<VALUE2>" ${infile} >> ${outfile} ...... (4 Replies)
Discussion started by: CarloM
4 Replies

4. Programming

Perl help for file handling

$# some text $$ some text $@ some text $$. some text Mg1 some text Mg2 some text . . . Mg10 some text The above 10 lines are to be extracted except the lines starting from $#,$$.,... (4 Replies)
Discussion started by: baig.abdul
4 Replies

5. Shell Programming and Scripting

UNIX File handling -Issue in reading a file

I have been doing automation of daily check activity for a server, i have been using sqls to retrive the data and while loop for reading the data from the file for several activities. BUT i got a show stopper the below one.. where the data is getting store in $temp_file, but not being read by while... (1 Reply)
Discussion started by: KuldeepSinghTCS
1 Replies

6. UNIX for Advanced & Expert Users

File handling

my input for a script is another csv file but in that file say 7 lines are there ... how can i get line by line to that input for example : >cat link.csv www.yahoo.com,yahoo www.google.com,google www.unix.com,unix another file in that file i need to ping the above links ... (2 Replies)
Discussion started by: ponmuthu
2 Replies

7. UNIX for Advanced & Expert Users

please help me in file handling

sir i have to get first line from a file for example >cat file1 abc zxc asd adsf from that file1 i need only first line expected result >abc please help me ! (1 Reply)
Discussion started by: ponmuthu
1 Replies

8. UNIX for Advanced & Expert Users

File Handling

Hi, I have a log file which runs into 3 to 5 GB. We store this typically for 6 months. When a new month starts we move the previous month into a 9 month back up log (file.9m) and delete the last month of the 9 month back up. Iam using awk to find the data and cat to join the files like... (3 Replies)
Discussion started by: baanprog
3 Replies

9. Programming

file handling

Hi all, I got a little issue here. Imagine that I have more than one process accessing one file. Is it possible to know which process(es) are accessing that file when I open the file?? Thanks for the help. Best regards, Ernesto (2 Replies)
Discussion started by: ninjanesto
2 Replies

10. Programming

File Handling in C

Hi all, I have a problem in handling files through C. here is the problem im having: i will query the database (for instance consider employees table ) for empno,ename,job,salary fields.The query returns me some 100 of rows. now i need to place them in a file in row wise pattern as they... (3 Replies)
Discussion started by: trinath
3 Replies
Login or Register to Ask a Question

Featured Tech Videos