Login or Register to Ask a Question and Join Our Community

Sponsored Content
Full Discussion: Accessing Multiple files using for loop
Top Forums Shell Programming and Scripting Accessing Multiple files using for loop Post 302426875 by radoulov on Thursday 3rd of June 2010 07:14:37 AM
Old 06-03-2010
Try:

Code:
for file in file1 file2 .. filen
[...]

Or:

Code:
for file in <glob pattern>
[...]

For example, if your files are named file1, file2 ..:

Code:
for file in file*
[...]


It's a good practice to quote your variables too:

Code:
tail -1 "$file"

 

10 More Discussions You Might Find Interesting

1. Shell Programming and Scripting

Sed inside bash script - accessing multiple files

I have a file (email) containing email addresses. I have a second file (terms) that contains simple regular expressions and words/characters. Here are some examples: \.trainee \.group \.web I want to go through email and delete lines containing the expressions/words from terms and write... (1 Reply)
Discussion started by: manouche
1 Replies

2. Shell Programming and Scripting

for loop, calling and editing multiple files inside

hey guys, I'm trying to call and modify multiple files inside the for loop, i can't get it to work... ------------------------ AFILE=/dir/a_file.txt BFILE=/dir/b_file.txt CFILE=/dir/c_file.txt ADESTFILE=/dir/a_dest_file.txt BDESTFILE=/dir/b_dest_file.txt... (6 Replies)
Discussion started by: DeuceLee
6 Replies

3. Shell Programming and Scripting

Read and edit multiple files using a while loop

Hi all, I would like to simply read a file which lists a number of pathnames and files, then search and replace key strings using a few vi commands: :1,$s/search_str/replace_str/g<return> but I am not sure how to automate the <return> of these vis commands when I am putting this in a... (8 Replies)
Discussion started by: cyberfrog
8 Replies

4. Shell Programming and Scripting

accessing variable from while loop

Hi all, Here is an outline of the problem: #variable declared at start of script x=0; #a function that increments x by 1 every 10 seconds incrementX(){ increments x every 10 seconds; } #i want this to output the value of x every second. The problem is that x is always reported... (3 Replies)
Discussion started by: free2rhyme2k
3 Replies

5. UNIX for Dummies Questions & Answers

Writing a for loop to manipulate multiple files

Hi, I have 1000 text files in a folder that are labeled data1.txt all the way to data1000.txt. I want to write a small script that manipulates the text files in this way: (1) cut the 2nd and 9th columns of the text files (2) sort by the numerical value in the 9th column (3) then save the rows... (3 Replies)
Discussion started by: evelibertine
3 Replies

6. Shell Programming and Scripting

FOR loop with multiple files as input and awk

Hi all , i want to pass multiple files as input to a for loop for i in file1 file2 file3 do some awk action < $i >> $i.out done but im getting error in that for loop is the way i use to pass files to awk using for correct and 2.we can directly pass multiple files to awk as... (7 Replies)
Discussion started by: zozoo
7 Replies

7. Shell Programming and Scripting

While loop for multiple files

Hi I need to loop until some files are not there .If lck file is there I need to sleep.until its not there I am writing a code like this while && && do echo "Lck file exits" sleep 1 done But this one is not working.Can some one help here please (1 Reply)
Discussion started by: ginrkf
1 Replies

8. Shell Programming and Scripting

Accessing multiple directories in loop

Hi Guys, I need to access multiple directories whcih is following similar structure and need to copy those files in desitination path. for eg : if ] then cd ${DIR}/Mon/loaded echo "copying files to $GRS_DIR" cp * ${DIR}/Mon/ echo "Files of Monday are Copied" fi if ] then... (5 Replies)
Discussion started by: rohit_shinez
5 Replies

9. Shell Programming and Scripting

Loop through multiple files in bash script

Hi Everybody, I'm a newbie to shell scripting, and I'd appreciate some help. I have a bunch of .txt files that have some unwanted content. I want to remove lines 1-3 and 1028-1098. #!/bin/bash for '*.txt' in <path to folder> do sed '1,3 d' "$f"; sed '1028,1098 d' "$f"; done I... (2 Replies)
Discussion started by: BabyNuke
2 Replies

10. Shell Programming and Scripting

Output Multiple Files in the For Loop

while IFS= read -r line do # sV for version detection nmap -T4 -Pn -v -sS "$line" > "text/$line" done < <(grep '' $file) Hi, where line represents the IP. I am using NMAP to do scanning. How can I set to execute that command in the loop several concurrently at a time instead of one... (5 Replies)
Discussion started by: alvinoo
5 Replies

LEARN ABOUT REDHAT

losetup

LOSETUP(8)						       MAINTENANCE COMMANDS							LOSETUP(8)

NAME

       losetup - set up and control loop devices

SYNOPSIS

       losetup [ -e encryption ] [ -o offset ] loop_device file
       losetup [ -d ] loop_device

DESCRIPTION

       losetup	is  used  to  associate loop devices with regular files or block devices, to detach loop devices and to query the status of a loop
       device. If only the loop_device argument is given, the status of the corresponding loop device is shown.

OPTIONS

       -d     detach the file or device associated with the specified loop device.

       -e encryption
	      enable data encryption. The following keywords are recognized:

	      NONE   use no encryption (default).
	      XOR    use a simple XOR encryption.
	      DES    use DES encryption. DES encryption is only available if the optional DES package has been added to the kernel. DES encryption
		     uses an additional start value that is used to protect passwords against dictionary attacks.

       -o offset
	      the data start is moved offset bytes into the specified file or device.

RETURN VALUE

       losetup returns 0 on success, nonzero on failure. When losetup displays the status of a loop device, it returns 1 if the device is not con-
       figured and 2 if an error occurred which prevented losetup from determining the status of the device.

FILES

       /dev/loop0,/dev/loop1,...   loop devices (major=7)

EXAMPLE

       If you are using the loadable module you must have the module loaded first with the command

	      # insmod loop.o

       The following commands can be used as an example of using the loop device.

	      dd if=/dev/zero of=/file bs=1k count=100
	      losetup -e des /dev/loop0 /file
	      Password:
	      Init (up to 16 hex digits):
	      mkfs -t ext2 /dev/loop0 100
	      mount -t ext2 /dev/loop0 /mnt
	       ...
	      umount /dev/loop0
	      losetup -d /dev/loop0

       If you are using the loadable module you may remove the module with the command

	      # rmmod loop

RESTRICTION

       DES encryption is painfully slow. On the other hand, XOR is terribly weak.

AUTHORS

       Original version: Theodore Ts'o <tytso@athena.mit.edu>
       Original DES by: Eric Young <eay@psych.psy.uq.oz.au>

Linux								    Nov 24 1993 							LOSETUP(8)
All times are GMT -4. The time now is 07:59 PM.
Unix & Linux Forums Content Copyright 1993-2022. All Rights Reserved.
Privacy Policy