Sponsored Content
Full Discussion: Syntax in a simple script
Top Forums UNIX for Beginners Questions & Answers Syntax in a simple script Post 303039718 by MadeInGermany on Sunday 13th of October 2019 11:39:55 AM
Old 10-13-2019
The first line backs up &0 (=stdin) to &10.
The next line associates &0 with the file (the file is opened for reading).
Then all following stdin/default reading is from the file. Here it is the read command in the loop.
The reading from the file would stop if &0 were restored via exec 0<&10.

Usually, instead of the exec association, you see a temporary association:
Code:
while read ...
do
...
done < './data/heu/hout1'

After the "redirected" while-do-done block the original stdin is back.
 

10 More Discussions You Might Find Interesting

1. Shell Programming and Scripting

Syntax error in a script...

Hi All, I have been fighting with a syntax error for the last 2 days, still haven't got the solution. Could you please help me, your help will be greatly appreciated. In my script I am getting a error in a for loop, its similar to the one as is below. for v_id in v1 v2 v3 v4 do... (8 Replies)
Discussion started by: rajus19
8 Replies

2. Shell Programming and Scripting

Syntax error in script

I get this error when I try to run my script (BTW, this is a simple script I am supposed to write for my class) $ menuscript menuscript: syntax error at line 89 : `"' unmatched $ Here is the code (Any help is greatly appreciated) (Line numbers included) 1 #!/bin/ksh 2 ... (2 Replies)
Discussion started by: KindHead
2 Replies

3. Programming

Tools for writing a simple syntax checker?

I'm trying to write a small utility for syntax checking. I've tried using Flex/Bison, but these seem too advanced for my task. A simpler tool would be appreciated. (1 Reply)
Discussion started by: Ilja
1 Replies

4. Shell Programming and Scripting

Syntax error calling TCL script from shell script

hello everyone i am beginner on shell scripting .and i am working on my project work on ad hoc network i wrote a batch (.sh) to do a looping and execute a tcl script i wrote before in each iteration ..but i got this problem " syntax error near unexpected token `('... (1 Reply)
Discussion started by: marcoss90
1 Replies

5. Shell Programming and Scripting

Help making simple perl or bash script to create a simple matrix

Hello all! This is my first post and I'm very new to programming. I would like help creating a simple perl or bash script that I will be using in my work as a junior bioinformatician. Essentially, I would like to take a tab-delimted or .csv text with 3 columns and write them to a "3D" matrix: ... (16 Replies)
Discussion started by: torchij
16 Replies

6. UNIX for Dummies Questions & Answers

Syntax Error Script

Hi guys i'd like to show you this code of my script, where i couldn't find this error " #! /bin/bash #copiabin.sh: copia todos los archivos ejecutables a bin if then mkdir $HOME/bin fi # copia de archivos y contador N N=0 for ARCH in * do if # Si el archivo es... (9 Replies)
Discussion started by: Newer
9 Replies

7. Shell Programming and Scripting

CHECK SCRIPT SYNTAX

Hi everyone, i'd like someone chechk this script, i know it's very simple but it doesn't work good, let me tell you this script works over huge directories, maybe that's the problem, if somebody can give me other way to develop, or show me where it's the problem, i'll appreciate it. ... (9 Replies)
Discussion started by: Newer
9 Replies

8. Shell Programming and Scripting

Help Simple FTP Script Here Syntax

I have a list of IP address and want to be assess whether FTP is allowing FTP access. I don't want to use lousy NT shell, but cannot get the syntax down on this. ftphosts.txt is a simple list of IP adresses. I want to iterate through the IPS and do a simple ftp IPadress user ftp password... (15 Replies)
Discussion started by: gdotoli
15 Replies

9. Linux

How to execute a simple select script using a shell script?

Hi team, I have two select statements and need to run them using SYSDBA user select * from temp_temp_seg_usage; select segment_name, tablespace_name, bytes/ (1024*1024) UsedMb from dba_segments where segment_name='TEMP_TEMP_SEG_USAGE'; Need to run this using a shell script say named... (1 Reply)
Discussion started by: pamsy78
1 Replies

10. Shell Programming and Scripting

Script syntax help

#!/bin/bash if ; then echo "Lipsa IP"; exit; fi i=1 ip=$1 while ; do if ; then rand=`head -$i pass_file | tail -1` user=`echo $rand | awk '{print $1}'` pass=`echo $rand | awk '{print $2}'` CMD=`ps -eaf | grep -c mysql` if ; then ./mysql $ip $user $pass & else sleep 15... (6 Replies)
Discussion started by: galford
6 Replies
PASSWD(1)							      OpenSSL								 PASSWD(1)

NAME
passwd - compute password hashes SYNOPSIS
openssl passwd [-crypt] [-1] [-apr1] [-salt string] [-in file] [-stdin] [-noverify] [-quiet] [-table] {password} DESCRIPTION
The passwd command computes the hash of a password typed at run-time or the hash of each password in a list. The password list is taken from the named file for option -in file, from stdin for option -stdin, or from the command line, or from the terminal otherwise. The Unix standard algorithm crypt and the MD5-based BSD password algorithm 1 and its Apache variant apr1 are available. OPTIONS
-crypt Use the crypt algorithm (default). -1 Use the MD5 based BSD password algorithm 1. -apr1 Use the apr1 algorithm (Apache variant of the BSD algorithm). -salt string Use the specified salt. When reading a password from the terminal, this implies -noverify. -in file Read passwords from file. -stdin Read passwords from stdin. -noverify Don't verify when reading a password from the terminal. -quiet Don't output warnings when passwords given at the command line are truncated. -table In the output list, prepend the cleartext password and a TAB character to each password hash. EXAMPLES
openssl passwd -crypt -salt xx password prints xxj31ZMTZzkVA. openssl passwd -1 -salt xxxxxxxx password prints $1$xxxxxxxx$UYCIxa628.9qXjpQCjM4a.. openssl passwd -apr1 -salt xxxxxxxx password prints $apr1$xxxxxxxx$dxHfLAsjHkDRmG83UXe8K0. 0.9.7a 2002-10-03 PASSWD(1)
All times are GMT -4. The time now is 10:49 AM.
Unix & Linux Forums Content Copyright 1993-2022. All Rights Reserved.
Privacy Policy