i would like to export a particular table in my oracle database installed in a hpux box. i would like to determine the filesize of the output before performing these action so i can assess if my harddisk can still handle it.
thanks as usuall :rolleyes: (1 Reply)
Hi all,
i am new to the unix enviorment i have got a urgent requirement where we need to migrate the date from the folder heirachy that contains the "IMAGES". These images are to be uploaded on to the database table.
Uploading images from the a single folder (Static) to the... (0 Replies)
HI All,
Newbie here.
I have a script which generates the tables in teradata database with time stamp like below.I want to add some more code to delete the archive tables which are 2months old.
. $HOME/.profile
t_name=$1
procdate=`date +%y%m%d`
log_dir=$Folder/log
tab=`echo... (0 Replies)
Hello Guys,
I'm new to Shell scripting, and i need someone to help me with this issue:
I'm trying to do a dynamic update query on Sysbase database table using shell script.
Lets say, the Update query is "update Table set id=X" , where X is dynamic value for the loop index.
If the loop is... (10 Replies)
Hi, I want to create a table on our unix box that allows the user to tab through it and select certain option by putting an asterix or similair into it.
e.g.
--------------
|Start App | |
|Stop App |*|
etc...
Can this be done using a script (never seen any graphics options in ksh, but... (2 Replies)
hi
i'm a bit stuck trying to find the correct syntax in order to run a cron job which just truncates all info from a single table in my database
i have a main database - db1
and i have a table in that database - userips
i wish to create a cron job that truncates or removes all the info... (9 Replies)
Hi ,
I have inserted some records in a table having column "value1 varchar2(4000)" and want to spool in a file.
I have written as below
set echo off
set feed off
set hea off
set wra off
set lin 500
spo temp_table
and fired select query as below
select value1 from temp_table;
spo... (6 Replies)
Hello
I have 2 servers that need a database table to be one way synchronized (server A needs to push the table to server B)
I considered using a FEDERATED DB, but decided against it for my particular application (Server B has several apps that would be calling the table repeatedly, and a... (3 Replies)
Hello All Members,
I am new to this forum and to the shell scripting. I want to write a shell script to do the following:
Scenario: I have a pipe delimited .txt file with multiple fields in it. The very first row of the file contains the name of the column which resembles the name of the... (18 Replies)
Discussion started by: chetanojha
18 Replies
LEARN ABOUT LINUX
unbuffer
UNBUFFER(1) General Commands Manual UNBUFFER(1)NAME
unbuffer - unbuffer output
SYNOPSIS
unbuffer program [ args ]
INTRODUCTION
unbuffer disables the output buffering that occurs when program output is redirected from non-interactive programs. For example, suppose
you are watching the output from a fifo by running it through od and then more.
od -c /tmp/fifo | more
You will not see anything until a full page of output has been produced.
You can disable this automatic buffering as follows:
unbuffer od -c /tmp/fifo | more
Normally, unbuffer does not read from stdin. This simplifies use of unbuffer in some situations. To use unbuffer in a pipeline, use the
-p flag. Example:
process1 | unbuffer -p process2 | process3
CAVEATS
unbuffer -p may appear to work incorrectly if a process feeding input to unbuffer exits. Consider:
process1 | unbuffer -p process2 | process3
If process1 exits, process2 may not yet have finished. It is impossible for unbuffer to know long to wait for process2 and process2 may
not ever finish, for example, if it is a filter. For expediency, unbuffer simply exits when it encounters an EOF from either its input or
process2.
In order to have a version of unbuffer that worked in all situations, an oracle would be necessary. If you want an application-specific
solution, workarounds or hand-coded Expect may be more suitable. For example, the following example shows how to allow grep to finish pro-
cessing when the cat before it finishes first. Using cat to feed grep would never require unbuffer in real life. It is merely a place-
holder for some imaginary process that may or may not finish. Similarly, the final cat at the end of the pipeline is also a placeholder
for another process.
$ cat /tmp/abcdef.log | grep abc | cat
abcdef
xxxabc defxxx
$ cat /tmp/abcdef.log | unbuffer grep abc | cat
$ (cat /tmp/abcdef.log ; sleep 1) | unbuffer grep abc | cat
abcdef
xxxabc defxxx
$
BUGS
The man page is longer than the program.
SEE ALSO
"Exploring Expect: A Tcl-Based Toolkit for Automating Interactive Programs" by Don Libes, O'Reilly and Associates, January 1995.
AUTHOR
Don Libes, National Institute of Standards and Technology
1 June 1994 UNBUFFER(1)