Sponsored Content
Top Forums UNIX for Dummies Questions & Answers How can I ... (Modifying large ASCII files) Post 4156 by andrewl68 on Thursday 19th of July 2001 02:37:00 PM
Old 07-19-2001
I dont think you will find a way to do that with a shell script. The only command that I know of would be csplit in a CShell script. this command only allow as maximum of 100 characters to be read at a time. I would suggest you look at a small C program to read the file character by character using a for loop.
 

10 More Discussions You Might Find Interesting

1. Shell Programming and Scripting

Perl - Appending/Modifying Excel files

Hi I have been using Spreadsheet::ParseExcel and Spreadsheet::WriteExcel to read and write excel workbooks, respectively. Spreadsheet::WriteExcel can only be used for creating new excel spreadsheets. I am looking for a module that would/should help me in appending to existing excel files.... (2 Replies)
Discussion started by: srinivay
2 Replies

2. Shell Programming and Scripting

modifying grep to get files only within last 2 hrs

Hi gurus I am currently using the below mentioned grep to find timestamp of last generated log file. touch -t $time_search dummy ecust_time_stamp=$(find . -name 'eCustomerCME*' -newer dummy -type f -exec ls -ltr {} \; | tail -1 | awk ' { print $6,$7,$8 } ') I calculate... (3 Replies)
Discussion started by: ragha81
3 Replies

3. Shell Programming and Scripting

Modifying command for Tar.gz Files.

:) Hi, I use the following command to search for a string in all the files in the directories and sub directories. find . -type f -print | xargs grep bermun@cial.net Can someone please cite a method wherin I can find the entries from a list of 300-500 *.gz files by modifying the above... (2 Replies)
Discussion started by: openspark
2 Replies

4. UNIX for Advanced & Expert Users

Formatting large Ascii file

Hi, I've got a very large ASCII file (1.5 GB), which doesn't have line terminators, making it impossible to read it right, i need to format it like: add line terminators. delete some lines on the file. delete some fields on all the remainings lines (can be identified by a string). After... (4 Replies)
Discussion started by: fahoo
4 Replies

5. Shell Programming and Scripting

.bashrc files modifying the PS1 variable?

Is there a command for finding all files on the system named ".bashrc" that modify the PS1 variable? I'd like to list the full file name(s) and the protection (including the full path). (5 Replies)
Discussion started by: raidkridley
5 Replies

6. Shell Programming and Scripting

modifying grep to return latest files

Hi guys, I currently use the below mwntioned grep statemen to get the timestamp of the last generated file in the directory. (ls -ltr eCustomerCME* | grep ^- | tail -1 | awk ' { print $6,$7,$8 } ') I need to modify this grep to search for files generated only within last 2 hrs. Can you pls... (5 Replies)
Discussion started by: ragha81
5 Replies

7. Shell Programming and Scripting

modifying xml files using sed

Hello, I have lots of xml files in the same format and I need to modify a xml tag in these files. i loop over the files and apply sed to the files to make the modification but CPU goes to %100 while doing this. I think I'm doing something wrong. Here is my onliner: for f in $( find . -name... (1 Reply)
Discussion started by: xyzt
1 Replies

8. Shell Programming and Scripting

Help with modifying files

Hello everyone, I have some data files, with mixed header formats. the sample for the same is: >ABCD76567.x1 AGTCGATCGTAGTCGTAGCTGT >ABCD76567.y1 AGTCGATCGTAGTCGTAGCTGT >ABCD76568.x1 pair_info:898989 AGTCGATCGTAGTCGTAGCTGT >ABCD76568.y1 pair_info:893489 AGTCGATCGTAGTCGTAGCTGT... (2 Replies)
Discussion started by: ad23
2 Replies

9. Shell Programming and Scripting

Modifying Variables in Files

hi list, I am currently looking to develop an installation script which writes out .conf files based on existing .conf files according to variables which are set in a settings file. For example I have a settings file like so: ip=192.168.1.1 hosts=localAnd I want to read a file which... (3 Replies)
Discussion started by: landossa
3 Replies

10. Shell Programming and Scripting

New code for modifying text files in a folder

Hi I want to create a code that can do this for all text files in a folder. The filenames are all listed in the following syntax UNIQUEID-LABID_ - .txt Each file has a unique ID and a different name and the content in the file looks like this: Kinship Analysis Report --- Likelihood... (12 Replies)
Discussion started by: kylle345
12 Replies
SCRIPT(1)							   User Commands							 SCRIPT(1)

NAME
script - make typescript of terminal session SYNOPSIS
script [options] [file] DESCRIPTION
script makes a typescript of everything displayed on your terminal. It is useful for students who need a hardcopy record of an interactive session as proof of an assignment, as the typescript file can be printed out later with lpr(1). If the argument file is given, script saves the dialogue in this file. If no filename is given, the dialogue is saved in the file type- script. OPTIONS
-a, --append Append the output to file or to typescript, retaining the prior contents. -c, --command command Run the command rather than an interactive shell. This makes it easy for a script to capture the output of a program that behaves differently when its stdout is not a tty. -e, --return Return the exit code of the child process. Uses the same format as bash termination on signal termination exit code is 128+n. -f, --flush Flush output after each write. This is nice for telecooperation: one person does `mkfifo foo; script -f foo', and another can supervise real-time what is being done using `cat foo'. --force Allow the default output destination, i.e. the typescript file, to be a hard or symbolic link. The command will follow a symbolic link. -q, --quiet Be quiet (do not write start and done messages to standard output). -t[file], --timing[=file] Output timing data to standard error, or to file when given. This data contains two fields, separated by a space. The first field indicates how much time elapsed since the previous output. The second field indicates how many characters were output this time. This information can be used to replay typescripts with realistic typing and output delays. -V, --version Display version information and exit. -h, --help Display help text and exit. NOTES
The script ends when the forked shell exits (a control-D for the Bourne shell (sh(1)), and exit, logout or control-d (if ignoreeof is not set) for the C-shell, csh(1)). Certain interactive commands, such as vi(1), create garbage in the typescript file. script works best with commands that do not manipulate the screen, the results are meant to emulate a hardcopy terminal. It is not recommended to run script in non-interactive shells. The inner shell of script is always interactive, and this could lead to unexpected results. If you use script in the shell initialization file, you have to avoid entering an infinite loop. You can use for example the .profile file, which is read by login shells only: if test -t 0 ; then script exit fi You should also avoid use of script in command pipes, as script can read more input than you would expect. ENVIRONMENT
The following environment variable is utilized by script: SHELL If the variable SHELL exists, the shell forked by script will be that shell. If SHELL is not set, the Bourne shell is assumed. (Most shells set this variable automatically). SEE ALSO
csh(1) (for the history mechanism), scriptreplay(1) HISTORY
The script command appeared in 3.0BSD. BUGS
script places everything in the log file, including linefeeds and backspaces. This is not what the naive user expects. script is primarily designed for interactive terminal sessions. When stdin is not a terminal (for example: echo foo | script), then the session can hang, because the interactive shell within the script session misses EOF and script has no clue when to close the session. See the NOTES section for more information. AVAILABILITY
The script command is part of the util-linux package and is available from Linux Kernel Archive <https://www.kernel.org/pub/linux/utils /util-linux/>. util-linux June 2014 SCRIPT(1)
All times are GMT -4. The time now is 10:59 AM.
Unix & Linux Forums Content Copyright 1993-2022. All Rights Reserved.
Privacy Policy