Read and write operations on files. Post: 303016404

9 More Discussions You Might Find Interesting

1. UNIX for Dummies Questions & Answers

How to read and write files one line at a time.

Hi! All! I am wirting a shell script in which i want to read one line at a time from the file and write it simultaneouly to other file one line at a time. Please let me know about some shell utility which can help me out. Thanx. If further clarifications are needed then please let me know...

2. Shell Programming and Scripting

Script with read/write Files

Hello, I am a Newbie in ksh Unix Script. So I must write a ksh/sh script who read character at a position in a File. So also it must read all the lines who belongs at these characters , then write these lines in a another File. Can you help me , or give little councils to advance with my...

3. UNIX for Dummies Questions & Answers

how to read or write device files

hi everybody, i am working in device drivers.As a beginner to this field ,i dont know how to read or write device files. Will copy_to_user and copy_from_user help me? I have created a device file using mknod command .Can anybody help me in this regard :confused thanks in advance sriram

4. Shell Programming and Scripting

SED command for read and write to different files

Hi I need some help on SED command I am writing a shell script which does the following: 1. Read one line at a time from a file abc.txt which has millions of lines 2. Prefix each line read with some text " 3. Post fix each line read with a quote " 4. Write the new modified...

5. Shell Programming and Scripting

Find all files with group read OR group write OR user write permission

I need to find all the files that have group Read or Write permission or files that have user write permission. This is what I have so far: find . -exec ls -l {} \; | awk '/-...rw..w./ {print $1 " " $3 " " $4 " " $9}' It shows me all files where group read = true, group write = true...

6. Programming

read/write files

Hi all, I have a problem with some read/write functions. I have a .bin file which contains a lot of structures as follows: struct alumno { char id; char apellido1; char apellido2; char nombre; float nota1p; float nota2p; float notamedia; char photofilename; }; What I have...

7. IP Networking

read/write,write/write lock with smbclient fails

Hi, We have smb client running on two of the linux boxes and smb server on another linux system. During a backup operation which uses smb, read of a file was allowed while write to the same file was going on.Also simultaneous writes to the same file were allowed.Following are the settings in the...

8. Solaris

write a script to execute some operations on sun solaris

Sun Microsystems Inc. SunOS 5.9 Generic May 2002 SUNFIRE V240 if there is a power failure, automatically: write all operations in a log file

9. Shell Programming and Scripting

How to read and write last modified timestamp to files?

Need help reading file last modified date in format: Filename (relative path);YYYYMMDDHHMMSS And then write it back. My idea is to backup it to a text file to restore later. Checked this command but does not work: Getting the Last Modification Timestamp of a File with Stat $ stat -f...

LEARN ABOUT OPENDARWIN

column

COLUMN(1)						    BSD General Commands Manual 						 COLUMN(1)

NAME

     column -- columnate lists

SYNOPSIS

     column [-tx] [-c columns] [-s sep] [file ...]

DESCRIPTION

     The column utility formats its input into multiple columns.  Rows are filled before columns.  Input is taken from file operands, or, by
     default, from the standard input.	Empty lines are ignored.

     The options are as follows:

     -c      Output is formatted for a display columns wide.

     -s      Specify a set of characters to be used to delimit columns for the -t option.

     -t      Determine the number of columns the input contains and create a table.  Columns are delimited with whitespace, by default, or with
	     the characters supplied using the -s option.  Useful for pretty-printing displays.

     -x      Fill columns before filling rows.

DIAGNOSTICS

     The column utility exits 0 on success, and >0 if an error occurs.

ENVIRONMENT

     COLUMNS  The environment variable COLUMNS is used to determine the size of the screen if no other information is available.

EXAMPLES

	   (printf "PERM LINKS OWNER GROUP SIZE MONTH DAY " ; 
	   printf "HH:MM/YEAR NAME
" ; 
	   ls -l | sed 1d) | column -t

SEE ALSO

     colrm(1), ls(1), paste(1), sort(1)

HISTORY

     The column command appeared in 4.3BSD-Reno.

BSD
								   June 6, 1993 							       BSD