Login or Register to Ask a Question and Join Our Community

Sponsored Content
Full Discussion: editing file in place
Top Forums Shell Programming and Scripting editing file in place Post 302233710 by era on Monday 8th of September 2008 09:06:43 AM
Old 09-08-2008
You are right that echo is not portably safe, but then printf might not be available on legacy platforms either. If it's available, it's a good solution.

I have a var="`dd if=/dev/zero`" running in another window. So far, it's looking like it's only constrained by available memory. Actually I think I'll kill it now ... 11GB so far, with no particular indication that we would hit the limit any time soon. But this is probably highly platform-dependent.
 

10 More Discussions You Might Find Interesting

1. Shell Programming and Scripting

Edit a large file in place

:confused:Folks, I have a file with 50 million records having 2 columns. I have to do the below: 1. Generate some random numbers of a fixed length. 2. Replace the second column of randomly chosen rows with the random numbers. I tried using a little bit of perl to generate random numbers... (6 Replies)
Discussion started by: mvijayv
6 Replies

2. Shell Programming and Scripting

Jump to a specific place in a file?

If I cat a file And want to go to the first instance of a particular value - what command would I use? And then from that point where I jumped to search for another value - but only search from that point forward not before the file? Thanks~ (2 Replies)
Discussion started by: llsmr777
2 Replies

3. Shell Programming and Scripting

How to insert a string in a file at specified place?

Hi all, I want to insert a string in a specified place of a very large file. I am giving an example of the task: I love football. Above is a sentence in a file and I want to insert a string "the" between love and football. It is not sure that where this particular line exists. It has to... (4 Replies)
Discussion started by: naw_deepak
4 Replies

4. Solaris

What is the best way to copy data from place to another place?

Dear Gurus, I need you to advice or suggestion about the best solution to copy data around 200-300G from serverA(location A) to serverB(location B). Normally, I will share folder and then copy but it takes too long time(about 2 days). Do you have any suggestion or which way should be... (9 Replies)
Discussion started by: unitipon
9 Replies

5. UNIX for Dummies Questions & Answers

Copy dir/file from one place to another.

Hello all. I'm not getting the hang of Paths. I have a dir w/files that I want to copy to another dir. Right now I am in the "source" directory. I want to copy it to Ch7. "cp -r source Ch7". Ch7 was already created. 1st msg.: cannot stat `source`: No such file or dir. I typed pwd & got... (3 Replies)
Discussion started by: Ccccc
3 Replies

6. Shell Programming and Scripting

Read from file specific place in file using inode

Hello, I am using tcsh on AIX. I would like to write a script that does the following: 1. given an inode, how do I find exactly the name of the file? I know I could do this using ls -i | grep <inode> but it returns: <inode> <filename>. I need some string manipulation or something to... (1 Reply)
Discussion started by: lastZenMaster
1 Replies

7. UNIX for Dummies Questions & Answers

how to place input from user into a file

as the title, how can i allow a user to key in one's name, birthday and email address and save it into a specific file i have created earlier? thank you so much for any reply. (3 Replies)
Discussion started by: branred
3 Replies

8. Shell Programming and Scripting

Cut text file in place

I have a file that i want to take only the first part of it and discard the rest, to be accurate,I need the first 137097 lines but I cant use split because I dont have enough space on my disck. I need sth to cut the file in its place (3 Replies)
Discussion started by: Heidi Heweidy
3 Replies

9. Shell Programming and Scripting

Check file availability and place flag file

I have to check a directory on Linux (via shell Script which I am trying to build) for about 20 different source files with file patterns and if the files are made available in the directory, I should place flag files for which my other ETL jobs are waiting on to kick off. If the source files are... (6 Replies)
Discussion started by: dhruuv369
6 Replies

10. Shell Programming and Scripting

Search for a file in all directories and place the file in that directory

Hi All, Daily I am getting the updated file. I have to search for this file in all directories and sub directories. If the file existed in a particular directory then move this updated file to that particular directory. If the file is not existed in any of the directories then place this... (4 Replies)
Discussion started by: ROCK_PLSQL
4 Replies

LEARN ABOUT DEBIAN

platform::shell

platform::shell(3tcl)					       Tcl Bundled Packages					     platform::shell(3tcl)

__________________________________________________________________________________________________________________________________________________

NAME

       platform::shell - System identification support code and utilities

SYNOPSIS

       package require platform::shell ?1.1.4?

       platform::shell::generic shell
       platform::shell::identify shell
       platform::shell::platform shell
_________________________________________________________________

DESCRIPTION

       The platform::shell package provides several utility commands useful for the identification of the architecture of a specific Tcl shell.

       This  package  allows the identification of the architecture of a specific Tcl shell different from the shell running the package. The only
       requirement is that the other shell (identified by its path), is actually executable on the current machine.

       While for most platform this means that the architecture of the interrogated shell is identical to the architecture of  the  running  shell
       this  is  not generally true. A counter example are all platforms which have 32 and 64 bit variants and where a 64bit system is able to run
       32bit code. For these running and interrogated shell may have different 32/64 bit settings and thus different identifiers.

       For applications like a code repository it is important to identify the architecture of the shell which will  actually  run  the  installed
       packages, versus the architecture of the shell running the repository software.

COMMANDS

       platform::shell::identify shell
	      This command does the same identification as platform::identify, for the specified Tcl shell, in contrast to the running shell.

       platform::shell::generic shell
	      This command does the same identification as platform::generic, for the specified Tcl shell, in contrast to the running shell.

       platform::shell::platform shell
	      This command returns the contents of tcl_platform(platform) for the specified Tcl shell.

KEYWORDS

       operating system, cpu architecture, platform, architecture

platform::shell 						       1.1.4						     platform::shell(3tcl)
All times are GMT -4. The time now is 01:00 PM.
Unix & Linux Forums Content Copyright 1993-2022. All Rights Reserved.
Privacy Policy