I have been trying to use read in a script with issues so I tried some things on the command line.
Code:
$ echo "testing 123" | read x ; echo $x
and
Code:
$ echo "testing 123" | read -r x ; echo $x
are only producing any output after being invoked the first time after rebooting the machine. I also got into some state where echo was producing "unbound variable" errors.
Can anyone point me in the right direction?
Mike
PS. This has something to do with subshells but I'm not exactly clear what is going on.
Last edited by Michael Stora; 07-23-2014 at 01:48 PM..
Hi,
I am working on a custom made FTP application. The application is behaving erratically for the "ls" command. Wild card character passed to the "ls" command (like "ls *temp") is giving inconsistent results. On debuggin I have found that the "ls" command is implemented as shown below in the... (7 Replies)
Hey i have a small script in which i check if a file with that pattern exists or not. If present then i go ahead with further processing.
In the present situation i have only one file with that name and for loop is reading twice. Here is the script. And the output of debug mode. Please help.... (5 Replies)
Hello. I'm getting very odd behavior when I try to change a user's password in Solaris 8. The shell, where it used to ask for a new passwd and a confirmation, now asks FOUR times, with two success message.
This is what happens every time:
# passwd myusername
New Password: xxxxxxxx
New... (2 Replies)
Hello!
I have a question about loops and arrays. I'm trying to go through this:
for aa in 01 02 03
OrigNum=$(grep ${Orig} Ba3In2F12.prepos | wc -l)
OrigNum=$((${OrigNum} - 1))
echo ${OrigNum}
etc
It gets stuck on the second line. The error reads:
./asdf: line 30:... (5 Replies)
Hello,
basically what this script is supposed to do is showing a list of hosts that is given a number, that you will be able to choose from a list.
A check is made to verify that the chosen number is within the array and this is where things go bad and I don't know why, bizarre.
I've spent... (5 Replies)
Hi Guys,
I have this script which is being called from another script,
sh +x SCRIPTNAME.
Now this script is failing saying the source file is missing. But i was able to see the source file was present. It was renamed and but somehow the source file is removed. There is no remove command in the... (1 Reply)
I have been using firefox3.5 now for some months and noticed that some images, notably in the png format, do not display correctly: the images are not displayed at all or display in part whereby the rest of the image shows a black rectangle. Does anybody else suffer from this problem?
Desktop:... (0 Replies)
Hi.
I want to use the DHCP server that comes with vxWorks 6.4.
The DHCP server implementation has a table that contains addresses of DHCP servers that will receive a copy of all the client requests that the local server gets, thus the server acts as a dhcp relay at the same time.
Can anyone... (4 Replies)
Hi,
I am currently reading a tar file and searching for a particular word using grep e.g. Plane. At the moment, if a sentence is found with the word "Plane" the sentence itself is piped to another file.
Here is the code i am using;
for jar in 'cat jar_file.tar'; do
tar -tvf... (3 Replies)
Hi,
I am facing issues with the below:
I have a lookup file say lookup.lkp.This lookup.lkp file contains strings delimited by comma(,).
Now i want to read this command from file and execute it.
So my code below is :
Contents in the lookup.lkp file is :
c_e,m,a,`cd $BOX | ls cef_*|tail... (7 Replies)
Discussion started by: vital_parsley
7 Replies
LEARN ABOUT DEBIAN
checkbashisms
CHECKBASHISMS(1) General Commands Manual CHECKBASHISMS(1)NAME
checkbashisms - check for bashisms in /bin/sh scripts
SYNOPSIS
checkbashisms script ...
checkbashisms --help|--version
DESCRIPTION
checkbashisms, based on one of the checks from the lintian system, performs basic checks on /bin/sh shell scripts for the possible presence
of bashisms. It takes the names of the shell scripts on the command line, and outputs warnings if possible bashisms are detected.
Note that the definition of a bashism in this context roughly equates to "a shell feature that is not required to be supported by POSIX";
this means that some issues flagged may be permitted under optional sections of POSIX, such as XSI or User Portability.
In cases where POSIX and Debian Policy disagree, checkbashisms by default allows extensions permitted by Policy but may also provide
options for stricter checking.
OPTIONS --help, -h
Show a summary of options.
--newline, -n
Check for "echo -n" usage (non POSIX but required by Debian Policy 10.4.)
--posix, -p
Check for issues which are non POSIX but required to be supported by Debian Policy 10.4 (implies -n).
--force, -f
Force each script to be checked, even if it would normally not be (for instance, it has a bash or non POSIX shell shebang or appears
to be a shell wrapper).
--extra, -x
Highlight lines which, whilst they do not contain bashisms, may be useful in determining whether a particular issue is a false posi-
tive which may be ignored. For example, the use of "$BASH_ENV" may be preceded by checking whether "$BASH" is set.
--version, -v
Show version and copyright information.
EXIT VALUES
The exit value will be 0 if no possible bashisms or other problems were detected. Otherwise it will be the sum of the following error val-
ues:
1 A possible bashism was detected.
2 A file was skipped for some reason, for example, because it was unreadable or not found. The warning message will give details.
SEE ALSO lintian(1).
AUTHOR
checkbashisms was originally written as a shell script by Yann Dirson <dirson@debian.org> and rewritten in Perl with many more features by
Julian Gilbey <jdg@debian.org>.
DEBIAN Debian Utilities CHECKBASHISMS(1)