12-06-2010
bash if/then on a single line
Is there a way in bash to do an if/then on a single line?
I want to do embed a command into an ssh session and check on the existance of a directory and then create it if necessary. I was able to do it in csh and it looks like this.
ssh $host_ip "if (!-d bin) mkdir bin"
How wopuld it look in bash?
10 More Discussions You Might Find Interesting
1. Shell Programming and Scripting
Let a script needs a variable to execute. For example if i run ./test.sh then it needs a variable as there is a <STDIN> in the script. I want to execute it as in command line.
Let test.sh requires a variable name $number I want to execute it by
>test number <enter>
how is it possible? (1 Reply)
Discussion started by: shoeb
1 Replies
2. Shell Programming and Scripting
hey gents,
I'm working on something that will use snmpwalk to query the devices on my network and retreive the device name, device IP, device model and device serial. I'm using Nmap for the enumeration and sed to clean up the results for use by snmpwalk. Once i get all the data organized I'm... (8 Replies)
Discussion started by: mitch
8 Replies
3. Shell Programming and Scripting
Hi,
I have a requirement with,
No~Dt~Notes
1~2011/08/1~"aaa
bbb
ccc
ddd
eee
fff
ggg
hhh"
Single column alone got splitted into multiple lines.
I require the output as
No~Dt~Notes
1~2011/08/1~"aaa<>bbb<>ccc<>ddd<>eee<>fff<>ggg<>hhh"
mean to say those new lines to be... (1 Reply)
Discussion started by: Bhuvaneswari
1 Replies
4. Shell Programming and Scripting
Hi,
My Oracle query is returing below o/p
----------------------------------------------------------
Ins trnas value
a lkp1 x
a lkp1 y
b lkp1 a
b lkp2 x
b lkp2 y ... (7 Replies)
Discussion started by: gvk25
7 Replies
5. Shell Programming and Scripting
Hi All,
I have 4 big files which contains one big line containing formatted character records, I need to format each file in such way that each File will have 95 Characters per line. Last line of each file will have newline character at end.
Before:-
File Name:- File1.dat
102 121340560... (10 Replies)
Discussion started by: lancesunny
10 Replies
6. Shell Programming and Scripting
here is what i want to achieve.. i have a file with below contents
cat fileName
blah blah blah
.
.DROP this
REJECT that
.
--sport 7800 -j REJECT --reject-with icmp-port-unreachable
--dport 7800 -j REJECT --reject-with icmp-port-unreachable
.
.
.
more blah blah blah
--dport 3306... (14 Replies)
Discussion started by: vivek d r
14 Replies
7. UNIX for Dummies Questions & Answers
Hi all,
How can i display the middle line of a file using a single line command? (6 Replies)
Discussion started by: Lakme Pemmaiah
6 Replies
8. UNIX for Beginners Questions & Answers
example of problem:
when I echo "$e" >> /home/cogiz/file.txt
result prints to file as:AA
BB
CC
I need it to save to file as this:AA BB CC
I know it's probably something really simple but any help would be greatly appreciated.
Thank You.
Cogiz (7 Replies)
Discussion started by: cogiz
7 Replies
9. UNIX for Beginners Questions & Answers
#!/bin/bash
PH=(AD QD QC 5H 6C 8C 7D JH 3H 3S)
echo ${PH}
In the above array, how can I print to screen just the first 8 elements of ${PH} and have the last 2 elements print just below the first line starting underneath AD?
I need to do this in order to save terminal window spacing... (5 Replies)
Discussion started by: cogiz
5 Replies
10. Shell Programming and Scripting
I want to read the log file which was generate from other command . And the output was having multi line in log files for job name and server name. But i need to make all the logs on one line
Source file
07/15/2018 17:02:00 TRANSLOG_1700 Server0005_SQL ... (2 Replies)
Discussion started by: ranjancom2000
2 Replies
LEARN ABOUT DEBIAN
syslogout
SYSLOGOUT(8) System Manager's Manual SYSLOGOUT(8)
NAME
syslogout - modular centralized shell logout mechanism
DESCRIPTION
syslogout is a generic approach to enable centralized shell logout actions for all users of a given system in a modular and centralized way
mostly aimed at avoiding work for lazy sysadmins. It has only been tested to work with the bash shell.
It basically consists of the small /etc/syslogout shell script which invokes other small shell scripts having a .bash suffix which are con-
tained in the /etc/syslogout.d/ directory. The system administrator can drop in any script he wants without any naming convention other
than that the scripts need to have a .bash suffix to enable automagic sourcing by the /etc/syslogout script.
For shell sessions, the contents of /etc/syslogout.d/" will be sourced by every user at logout if the following lines are present in his
$HOME/.bash_logout:
if [ -f /etc/syslogout ]; then
. /etc/syslogout
fi
If used for X sessions it is advisable to include the former statement into the Xreset script of the X display manager instead to prevent
that closing of an terminal emulator window yields unexpected results in your running X session if your X11 terminal emulator is using a
login shell. Be sure then to run it under the user-id of the X session's user. See the example files in /usr/share/doc/syslogout/ for
illustration.
Users not wanting /etc/syslogout to be sourced for their environment can easily disable it's automatic mechanism. It can be disabled by
simply creating an empty file called $HOME/.nosyslogout in the user's home directory using e.g. the touch(1) command.
Any single configuration file in /etc/syslogout.d/ can simply be overridden by any user by creating a private $HOME/.syslogout.d/ directory
which may contain a user's own version of any configuration file to be sourced instead of the system default. It's names have just to
match exactly the system's default /etc/syslogout.d/ configuration files. Empty versions of these files contained in the $HOME/.syslo-
gout.d/ directory automatically disable sourcing of the system wide version.
Naturally, users can add and include their own private scripts to be automagically executed by /etc/syslogout at logout time.
OPTIONS
There are no options other than those dictated by shell conventions. Anything is defined within the configuration scripts themselves.
SEE ALSO
The README files and configuration examples contained in /usr/share/doc/syslogout/ and the manual page for bash(1), xdm(1x),
xdm.options(5), and wdm(1x). Recommended further reading is everything related with shell programming.
If you need a similar mechanism for executing code at login time check out the related package sysprofile(8) which is a very close compan-
ion to syslogout.
BUGS
syslogout in its current form is mainly restricted to bash(1) syntax. In fact it is actually a rather embarrassing quick and dirty hack
than anything else - but it works. It serves the practical need to enable a centralized bash configuration until something better
becomes available. Your constructive criticism in making this into something better" is very welcome. Before i forget to mention it: we
take patches... ;-)
AUTHOR
syslogout was developed by Paul Seelig <pseelig@debian.org> specifically for the Debian GNU/Linux system. Feel free to port it to and use
it anywhere else under the conditions of either the GNU public license or the BSD license or both. Better yet, please help to make it into
something more worthwhile than it currently is.
SYSLOGOUT(8)