Standard input and output amount to pre-opened files. Usually, standard input is connected to your keyboard, and standard output is connected to your screen, but the shell lets you attach them to anything you want like this:
< redirects standard input. Any commands you run in that script, and the read builtin, will read from inputfile instead of the keyboard.
> redirects standard output. Any commands you run, and the echo builtin, will write to outputfile instead of the terminal.
So when they are telling you to read from standard input, they are telling you to just read from the default with read and feed whatever you want into it later.
You use read like
and if the first line is A B C D E, it effectively does VAR1="A"; VAR2="B" ; VAR3="C" ; VAR4="D E"
And 'standard output' just means 'print to the terminal with echo or whatever'.
We really can't give you a direct answer, we can give you the tools. And this should really be in the homework forum, please re-post there following the homework template.
Hi,
For one of my programs, I need to have a hashtable as in Perl. Unfortunately shell doesnt provide any variable like hash. Is there anyway/trick, I could implement a hash in shell (using shell scripts/sed/awk).
JP (2 Replies)
Dear all:
I want to write a script capable of reading specific rows and collumns of a table, into a variable.
Just imagine i have a file named table.dat which contains:
GENERAL INFORMATION
Col 1 Col2 Col3
1 1
2 2
3 3
4 4
What i want to do... (13 Replies)
Hi All,
I want to connect two tables in DB2 using shell script and then compare the contents of two tables field by field. Could any one please help me in connecting database tables using Unix and retriving data from the same.
Thanks,
Durwas (0 Replies)
Hi all,
I need to create a matrix of variable rows and columns. Right now i have 3 rows and two columns and following values.
Output something like
TypeA TypeB
TestCase1 Pass Fail
TestCase2 Pass ... (2 Replies)
I am trying to truncate a table using below script. When I ran the script it runs fine but table was not truncated and the spool is empty. I am not sure what is wrong with pl/sql block.
#!/bin/ksh
# ----------------------------------------------------------------------
#
# Created by: XXXX... (2 Replies)
Hi,
Can anyone tell me that, How to create table in Oracle database through shell script(ksh).
Table contains 3 fields,
1] Emp ID, String, primary key
2] Name, String
3] B Date, date.
Thanks in advance. (6 Replies)
Hi, unix gurnis
I need help for following requirement for writing a shell scritp.
log in to oracle database, query one table total records (select count(*) from table1), pass the return value to a file.
Thanks in advance (2 Replies)
Hi,
I'm an amateur and need your help in figuring this out. I have been asked to connect to a prod db from non-prod env., and download a table from prod db to non-prod env.
I was able to connect to the prod db and then run a simple query as below.
@@@@@@@@@@
... (7 Replies)
Discussion started by: arunpvp
7 Replies
LEARN ABOUT OSX
platform::shell
platform::shell(n) Tcl Bundled Packages platform::shell(n)
__________________________________________________________________________________________________________________________________________________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(n)