Is there any way to do variable nesting using sh?
For example:
example_1="a test string"
example_2="another test"
example_3="etc..."
i=2
echo ${example_$i}
The shell reports:
sh: ${example_$i}: bad substitution
If not, maybe someone could suggest another method. Thanks in... (3 Replies)
I need help getting over this bump on how nested for loops work in shell. Say i was comparing files in a directory in any other language my for loop would look like so
for(int i=0;to then end; i++)
for(int y = i+1; to the end; y++)
I can't seem to understand how i can translate that... (5 Replies)
Greetings All,
The following script attempts to enumerate all users in all groups in the group file(GROUP) and echo the following information:
GROUP ---> USER
The script is as follows:
IFS=","
for GROUP in `ypcat -k group | cut -d" " -f1`
do
for USER in `ypcat -k group... (13 Replies)
Trying to clean up the last little thing in this script which is that the mv always performs no matter whether it is needed or not. It doesn't cause any bugs just prints an unsightly "can't mv source and dest are the same". Obviously I want to get rid of it but having issues getting the... (4 Replies)
Hi there,
I have nested case in my script. I am asking user, want to continue? if user press y/Y then my inner case should continue, rather than that my code start from beginning. I would like to continue my inner case until user press n or N. Is any one tell me how can I do?
Thanking You,... (2 Replies)
Hi,
I have to assign a value for a varaiable based on a Input. I have written the below code:
if
then
nf=65
elif
then
nf=46
elif
then
nf=164
elif
then
nf=545
elif
then
nf=56
elif
then (3 Replies)
Hi Team,
I just want to check whether my nested if loop used is correct or not.
if ]
if ]
export1
else
export2
fi
else
if ]
export3
else
export4
fi
fi
Thanks
Shiva (5 Replies)
HI everyone,
I am not able to find error in the script, when i run the script till
line No. 20
i.e, read var4
everything runs fine. After that the script exits out.
#!/bin/bash
echo -e "Want dryrun OR merge: \n "
read var1
if ] ; then
echo -e "\n Please select from the given... (10 Replies)
Discussion started by: rishi.aradhya
10 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)