Visit Our UNIX and Linux User Community


shell script to read file line by line


 
Thread Tools Search this Thread
Top Forums UNIX for Dummies Questions & Answers shell script to read file line by line
# 1  
Old 07-11-2009
shell script to read file line by line

Hi,

I need to read a text file from shell script line by line and copy the feilds of each line.
Below is the complete requirement.


I've text file which contains ...


pgm1 file11 file12 file13
pgm2 file21 file22
pgm3 file31 file32 file33



I'll give input as pgm1/pgm2/pgm3 etc.

the shell script has to read the text file and if the input given is pgm1 then the shell script shoud copy the file to some directory.
file directory is common for all the files.

when the input is pgm2 then the shell script should have statements for copying file21, file22 etc and so on.

I tried the file reading with WHILE DO and FOR LOOP and used CUT option to differentiate the feilds. But I'm getting all the records with the looping and I'm unable to cut exactly as the number of files for each program differs.

Can anybody suggest code which completes my requirement?
I'm using KSH.

Thanks,
Ani
# 2  
Old 07-11-2009
Code:
cp $(grep pgm1 file | cut -d " " -f 2-) new_directory 2>/dev/null || echo Error

Or in a script:
Code:
[ $# -eq 0 ] && echo "Tell me what to copy..." && exit 1
 
for KEY in $@; do
  cp $(grep $KEY file | cut -d " " -f 2-) new_directory 2>/dev/null || echo Error
done

Where file is the file containing
Code:
pgm1 file11 file12 file13
pgm2 file21 file22
pgm3 file31 file32 file33

# 3  
Old 07-12-2009
Try this:
set `egrep '^pgm2' temp.txt` | cp $2 $3 $4 $5 $5 $7 new_directory

Assumed "temp.txt" is the input files.
Assumed "new_directory" is the directory to copy to.
Assumed max. number of files to copy is 7.
If not increase/decrease $2......$7.
Do not use $0 or $1.

Take care of error trapping and consider writing into a script.
Ex: What if egrep finds nothing?
set `egrep '^pgm' temp.txt` && cp $2 $3 $4 $5 $5 $7 new_directory
(Note the && in the above line)
# 4  
Old 07-13-2009
Thanks for the reply.

For the below query, I need to search for the file in 2 directories and if the file is available then copy the file from that directory.

for ex: if the pgm is pgm1 and first field is file11 then

if the file11 is in dir1 then copy /dir1/file11 to new directory else if the file11 is in dir2, then
copy /dir1/file11 to new directory else exit.

that means the text file contains only filename and not the full path. The shell script should search the files in 2 directories.

the code is :
for KEY in $@; do
cp $(grep $KEY file | cut -d " " -f 2-) new_directory 2>/dev/null || echo Error
done


Thanks,
Ani
# 5  
Old 07-13-2009
Not sure if I got you right.
Presume this is what you are looking for.

set `egrep '^pgm2' temp.txt`
cd dir1
cp $2 $3 $4 $5 $5 $7 new_directory
cd dir2
cp $2 $3 $4 $5 $5 $7 other_directory

If it does not find the file(s) in dir1 or dir2 it might throw some error.
I think you can ignore them. Is that OK?
 

Previous Thread | Next Thread

10 More Discussions You Might Find Interesting

1. Shell Programming and Scripting

Shell script UNIX to read text file line by line

i have a text file as belows, it includes 2 columns, 1st is the column name, 2nd is the file_name data_file.txt column_name file_name col1 file1 col2 file2 col3 file1 col4 file1 col5 file2 now, i would like to... (4 Replies)
Discussion started by: tester111
4 Replies

2. Shell Programming and Scripting

With script bash, read file line per line starting at the end

Hello, I'm works on Ubuntu server My goal : I would like to read file line per line, but i want to started at the end of file. Currently, I use instructions : while read line; do COMMAND done < /var/log/apache2/access.log But, the first line, i don't want this. The file is long... (5 Replies)
Discussion started by: Fuziion
5 Replies

3. 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

4. Shell Programming and Scripting

How to read a two files, line by line in UNIX script and how to assign shell variable to awk ..?

Input are file and file1 file contains store.bal product.bal category.bal admin.bal file1 contains flip.store.bal ::FFFF:BADC:CD28,::FFFF:558E:11C5,6,8,2,1,::FFFF:81C8:CA8B,::FFFF:BADC:CD28,1,0,0,0,::FFFF:81C8:11C5,2,1,0,0,::FFFF:81DC:3111,1,0,1,0 store.bal.... (2 Replies)
Discussion started by: veeruasu
2 Replies

5. Shell Programming and Scripting

HELP: Shell Script to read a Log file line by line and extract Info based on KEYWORDS matching

I have a LOG file which looks like this Import started at: Mon Jul 23 02:13:01 EDT 2012 Initialization completed in 2.146 seconds. -------------------------------------------------------------------------------- -- Import summary for Import item: PolicyInformation... (8 Replies)
Discussion started by: biztank
8 Replies

6. Shell Programming and Scripting

Shell script to read multiple options from file, line by line

Hi all I have spent half a day trying to create a shell script which reads a configuration file on a line by line basis. The idea of the file is that each will contain server information, such as IP address and various port numbers. The line could also be blank (The file is user created). Here... (1 Reply)
Discussion started by: haggismn
1 Replies

7. Shell Programming and Scripting

Shell script to read a text file line by line & process it...

Hi , I am trying to write an shell, which reads a text file (from a location) having a list of numbers of strictly 5 digits only ex: 33144 Now my script will check : 1) that each entry is only 5 digits & numeric only, no alphabets, & its not empty. 2)then it executes a shell script called... (8 Replies)
Discussion started by: new_to_shell
8 Replies

8. Shell Programming and Scripting

how can u read a file line by line in shell script ?

hello , plz help for below script req:- how can we read a file line by line in shell script ? (4 Replies)
Discussion started by: abhigrkist
4 Replies

9. Shell Programming and Scripting

bash: read file line by line (lines have '\0') - not full line has read???

I am using the while-loop to read a file. The file has lines with null-terminated strings (words, actually.) What I have by that reading - just a first word up to '\0'! I need to have whole string up to 'new line' - (LF, 10#10, 16#A) What I am doing wrong? #make file 'grb' with... (6 Replies)
Discussion started by: alex_5161
6 Replies

10. Shell Programming and Scripting

shell script to read a line in gps receiver log file and append that line to new file

Hi, I have gps receiver log..its giving readings .like below Trying 127.0.0.1... Connected to localhost. Escape character is '^]'. GPSD,R=1 $GPGSV,3,1,11,08,16,328,40,11,36,127,00,28,33,283,39,20,11,165,00*71... (3 Replies)
Discussion started by: gudivada213
3 Replies

Featured Tech Videos