Login or Register to Ask a Question and Join Our Community

Sponsored Content
Full Discussion: Detail on For loop for multiple file input and bash variable usage
Top Forums Shell Programming and Scripting Detail on For loop for multiple file input and bash variable usage Post 302781353 by Don Cragun on Saturday 16th of March 2013 09:24:56 AM
Old 03-16-2013
I don't understand what you're asking about fortran code, but getting sets of 3 files in sorted order in the shell is not hard. This doesn't do anything very useful, but may be a suitable example to show you what needs to be done to meet your requirements:
Code:
#!/bin/ksh
ls *.txt|sort -t"_" -k2n,2|while read f1 && read f2 && read f3
do      echo processing $f1, $f2, and $f3
done

Note that this won't work if any of your *.txt filenames contain whitespace characters, and will silently ignore the last one or two *.txt files if the number of *.txt files is not an integral multiple of 3. In a directory containing the files:
Code:
ABC_6.txt
B.txt
DEF_5.txt
GHI_7.txt
a.txt
abc_123.txt
bcd_987.txt
cde_456.txt
tester
z.txt

this script produces the output:
Code:
processing B.txt, a.txt, and z.txt
processing DEF_5.txt, ABC_6.txt, and GHI_7.txt
processing abc_123.txt, cde_456.txt, and bcd_987.txt

This User Gave Thanks to Don Cragun For This Post:
Akshay Hegde
 

10 More Discussions You Might Find Interesting

1. Shell Programming and Scripting

Basic bash 'for loop' usage

Hi! I have a simple question about using a for loop. I'm trying to open up all the zip files in the currect directory with ark, but I am getting the error "bash: syntax error near unexpected token `for $i ; do ark $i ; done ; I looked in the info pages for bash, but I can't seem to figure... (2 Replies)
Discussion started by: Orange Stripes
2 Replies

2. UNIX for Dummies Questions & Answers

usage of same variable in multiple scripts

Hi, I have a .test file which has: #!/bin/ksh export TEST_FLAG=1 In the test1.ksh i have: #!/bin/ksh . .test echo $TEST_FLAG When i execute the test1.ksh its showing the value as 1. But if i refer the same variable in another script, the value is not 1. Basically, I need to have... (1 Reply)
Discussion started by: risshanth
1 Replies

3. Shell Programming and Scripting

bash and ksh: variable lost in loop in bash?

Hi, I use AIX (ksh) and Linux (bash) servers. I'm trying to do scripts to will run in both ksh and bash, and most of the time it works. But this time I don't get it in bash (I'm more familar in ksh). The goal of my script if to read a "config file" (like "ini" file), and make various report.... (2 Replies)
Discussion started by: estienne
2 Replies

4. UNIX for Dummies Questions & Answers

Writing a for loop that processes multiple input files

I would like to write a for loop that does the following: I have a file called X.txt and other files called 1.txt,2.txt, .....,1000.txt. I want to substitute the 6th column of the file X.txt with 1.txt and store the output as X.1. Then I want to do the same with X.txt and 2.txt and store the... (1 Reply)
Discussion started by: evelibertine
1 Replies

5. Shell Programming and Scripting

(BASH) Using a loop variable to grep something in a file?

Hi, I have a loop running until a variable L that is read previously in the full script. I'd like to grep some information in an input file at a line that contains the value of the loop parameter $i. I've tried to use grep, but the problem is nothing is written in the FILE files. It seems grep... (5 Replies)
Discussion started by: DMini
5 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. AIX

Disk Usage in Detail !!

Hi ALL, I always use du command for analyzing diskusage to housekeep a filesystem. Can somebody tell the where first row filesize resides? bash-3.2# df -gt /tmp Filesystem GB blocks Used Free %Used Mounted on /dev/hd3 16.50 10.01 6.49 61% /tmp bash-3.2# bash-3.2# pwd... (6 Replies)
Discussion started by: Thala
6 Replies

8. Shell Programming and Scripting

Bash loop hording keypress input

I have a bash loop that waits for a single key press, then does $something depending on what $key is pressed before refreshing the screen with updated data. The problem I have is that the script will store additional key presses and chain them together causing the screen to redraw and the script... (1 Reply)
Discussion started by: DarkPhoenix
1 Replies

9. Shell Programming and Scripting

While loop with input in a bash script

I have the following while loop that I put in a script, demo.sh: while read rna; do aawork=$(echo "${rna}" | sed -n -e 's/\(...\)\1 /gp' | sed -f rna.sed) echo "$aawork" | sed 's/ //g' echo "$aawork" | tr ' ' '\012' | sort | sed '/^$/d' | uniq -c | sed 's/*\(*\) \(.*\)/\2: \... (3 Replies)
Discussion started by: faizlo
3 Replies

10. UNIX for Beginners Questions & Answers

Bash Variable scope - while loop while reading from a file

Cope sample1: test.sh i=0 echo " Outside loop i = $i " while do i=$(( $i + 1)) echo "Inside loop i = $i " done echo " Out of loop i is : $i " When run output : Outside loop i = 0 Inside loop i = 1 Inside loop i = 2 Inside loop i = 3 Inside loop i = 4 Inside loop i = 5 Inside... (8 Replies)
Discussion started by: Adarshreddy01
8 Replies

LEARN ABOUT DEBIAN

h5jam

h5jam(1)						      General Commands Manual							  h5jam(1)

NAME

       h5jam - Add a user block to a HDF5 file

SYNOPSIS

       h5jam -u user_block -i in_file.h5 [-o out_file.h5] [--clobber]

DESCRIPTION

       h5jam  concatenates  a  user_block  file  and an HDF5 file to create an HDF5 file with a user block. The user block can be either binary or
       text. The output file is padded so that the HDF5 header begins on byte 512, 1024, etc.. (See the HDF5 File Format.)

       If out_file.h5 is given, a new file is created with the user_block followed by the contents of in_file.h5.   In	this  case,  infile.h5	is
       unchanged.

       If out_file.h5 is not specified, the user_block is added to in_file.h5.

       If  in_file.h5  already	has  a	user  block,  the contents of user_block will be added to the end of the existing user block, and the file
       shifted to the next boundary. If --clobber is set, any existing user block will be overwritten.

EXAMPLE USAGE

       Create new file, newfile.h5, with the text in file mytext.txt as the user block for the HDF5 file file.h5.

	    h5jam -u mytext.txt -i file.h5 -o newfile.h5

       Add text in file mytext.txt to front of HDF5 dataset, file.h5.

	    h5jam -u mytext.txt -i file.h5

       Overwrite the user block (if any) in file.h5 with the contents of mytext.txt.

	    h5jam -u mytext.txt -i file.h5 --clobber

RETURN VALUE

       h5jam returns the size of the output file, or -1 if an error occurs.

CAVEATS

       This tool copies all the data (sequentially) in the file(s) to new offsets. For a large file, this copy will take a long time.

       The most efficient way to create a user block is to create the file with a user block (see H5Pset_user_block), and  write  the  user  block
       data into that space from a program.

       The  user block is completely opaque to the HDF5 library and to the h5jam and h5unjam tools.  The user block is simply read or written as a
       string of bytes, which could be text or any kind of binary data.  It is up to the user to know what the contents of the	user  block  means
       and how to process it.

       When the user block is extracted, all the data is written to the output, including any padding or unwritten data.

       This tool moves the HDF5 file through byte copies, i.e., it does not read or interpret the HDF5 objects.

SEE ALSO

       h5dump(1), h5ls(1), h5diff(1), h5import(1), gif2h5(1), h52gif(1), h5perf(1), h5unjam(1).

																	  h5jam(1)
All times are GMT -4. The time now is 12:39 AM.
Unix & Linux Forums Content Copyright 1993-2022. All Rights Reserved.
Privacy Policy