I am attempting to pass a string into awk and loop through it, and then for every occurrance of a certain character perform an action. In this case, for example, echo 1 for each time character r is found in the string. Except I can't get it to work. Could someone please tell me why?
echo... (7 Replies)
#!/usr/bin/ksh
echo Please enter
while read n
do
echo $n >> datafile
done
question:
How can I enject an if statement that if the users enter 0 (zero) the program will exit?
this is what I have but not working
#!/usr/bin/ksh
echo Please enter number
while read n
do
if $n=0
then... (2 Replies)
Hi,
Again a little problem.
Do not understand good why an empty string is not detected.
Here is the program:
#!/bin/ksh
APR=`date | grep Apr | awk '{print $2$3}'`
MAY=`date | grep May | awk '{print $2$3}'`
JUN=`date | grep Jun | awk '{print $2$3}'`
echo "Variable Apr has value:... (6 Replies)
Hello I am very new to shell and I bought some books and trying to learn it. I started trying to write a script that will take a number and count it down to 1 with commas in between. This number can only be one argument. If lower than one or higher than one argument it sends an error message. ... (4 Replies)
I need to match multiple values in a single column in a file:
example:
Source file:
abd,123,one
def,232,two
ghi,987,six
Target file:
12345,abcde,123
09876,zxvyr,566
56789,lmnop,232
Variable:
var1=`grep 2 sourcefile | awk '{print$1}'
essentially, echo "$var1" would read:... (2 Replies)
Hi,
I'm a rookie who is trying to learn this stuff. What I need help with is putting together a non complicated "while" loop within the below "if" statement. I also need the while loop to keep looping until the user types a key to end the loop. Please reveal the proper insertion points. Thank... (4 Replies)
Hi I am trying to create a table within an awk if statement
awk -F, '{ if ($8 ~ /Match/)
BEGIN{print "<table>"} {print "<tr>";for(i=1;i<=NF;i++)print "<td>" $i"</td>";print "</tr>"} END{print "</table>"}' SN1.csv | mailx -s "Your details" abc@123.com
But this doesnt work..
Please suggest (8 Replies)
Table TAB1 contains following example data (its a tree sitting in table data format & its driven based CHILD & PARENT column pick the RULE condition to generate the below SQL:
CHILD PARENT SS MID MNM VNM RULE FLG
1 ? S1 ? ? V1 rule004 I
2 1 S1 ? ? V1 0 Z
3 1 S1 ? ? V1 1 Z ... (6 Replies)
Hello Frens,
I am a newbie to shell scripting. I need a help on creating a for loop script (shell script) for removing files. I have a table called a_table with column name fil_name which contains all the files that need to be removed.
Thank you in advance (6 Replies)
I have created one file that contains all the necessary info in it to create a download link. In each of the lines /results/analysis/output/Home/Auto_user_S5-00580-6-Medexome_67_032/plugin_out/FileExporter_out.67... (8 Replies)
Discussion started by: cmccabe
8 Replies
LEARN ABOUT DEBIAN
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)