SSH Scripting:
Start the program with statement: #!/usr/bin/sh
We can also include: store_date=`date '+%Y%m%d%H%M'` Echo: The command prints what is given on display
e.g.
#!/usr/bin/sh
store_date=`date '+%Y%m%d%H%M'`
# My first script {Comments after #. Anything after # will not be compiled}
echo "Hello World!"
Output on terminal: Hello World! chmod 755 first_script
chmod 755 will give read, write, and execute permission to the file `first_script` ./first_script
The statement above is used to execute the file in terminal mkdir bin
mkdir is used to create a new directory type command
type will display what type of command it is
I/O Redirection
Standard Output
Most command line programs that display their results do so by sending their results to a facility called standard output.3
ls > file_list.txt
In this example, the ls command is executed and the results are written in a file named file_list.txt. Each time the command above is repeated, file_list.txt is
overwritten (from the beginning) with the output of the commandls. If you want the new results to be appended to the file instead, use ">>" like this ls >> file_list.txt
Standard Input
Many commands can accept input from a facility called standard input. sort < file_list.txt
In the above example we used the sort command to process the contents of
file_list.txt. The results are output on the display since the standard output is not redirected in this example. We could redirect standard output to another file like this:
sort < file_list.txt > sorted_file_list.txt
PIPES
With pipes, the standard output of one command is fed into the standard input of another
ls -l | less
In this example, the output of the ls command is fed into less. By using this "| less" trick, you can make any command have scrolling output
Command What it does
ls -lt | head Displays the 10 newest files in the current
directory.
du | sort -nr Displays a list of directories and how much space they consume, sorted from the
largest to the smallest.
find . -type f -print | wc -l Displays the total number of files in the
current working directory and all of its
FILTERS
Program What it does
sort Sorts standard input then outputs the sorted result on standard
output.
duplicate lines of data (i.e., it makes sure that every line is unique).
grep Examines each line of data it receives from standard input and
outputs every line that contains a specified pattern of characters.
fmt Reads text from standard input, then outputs formatted text on
standard output.
pr Takes text input from standard input and splits the data into pages
with page breaks, headers and footers in preparation for printing.
head Outputs the first few lines of its input. Useful for getting the header
of a file.
tail Outputs the last few lines of its input. Useful for things like getting
the most recent entries from a log file.
tr
Translates characters. Can be used to perform tasks such as upper/lowercase conversions or changing line termination
characters from one type to another (for example, converting DOS text files into Unix style text files).
sed Stream editor. Can perform more sophisticated text translations
than tr.
awk An entire programming language designed for constructing filters.
Extremely powerful.
Mobatch: Purpose: To send moshell commands to several nodes in parallel. Arguments:
- The first argument is the sitefile, sitelist, or dumpdir.
The sitefile is a file containing the list of sites to connect to. Each line in the sitefile contains:
* The IP/DNS addresses and/or site names whose IP address are defined in the IP database.
* Optionally: the uservariables/scriptingvariables to input with -v option.
See example of sitefile and ipdatabase in: moshell/examples/mobatch_files/
If using the sitelist, the sites are listed on the command line and separated by commas.
The dumpdir is a directory containing:
* or CVs/dbdat files (format: <cv.zip> or <db.dat>) -> only supported with option "-d"
- The second argument is the commmands or commandfile. See example of commands below and commandfile in
moshell/examples/mobatch_files
If a directory is given, then a different commandfile will be used for each node:
the name of each commandfile should be <node-name>.cmd or <node-name>.mos
the <node-name> should be the same as given in the sitefile. example: node-name is rbs602 ==> commandfile should be rbs602.cmd or rbs602.mos
- The third argument (logdirectory) is optional. If no logdirectory is specified, a default one will be used.
Options:
- t <minutes> Specify the number of minutes before timing out. Set to 0 for no timeout (default=20 minutes)
- p <processes> Specify the maximum number of moshell sessions that will run in parallel (default=10 parallel sessions)
- i <seconds> Specify the interval in seconds between spawning of each moshell session (default=0 seconds)
- w <seconds> Specify the interval in seconds between the checks on running sessions (default= 2.5 seconds)
- v <userVariables> Specify moshell uservariables. Type "moshell" on its own for more info about this option.
- o Print output of every moshell session both to screen and to logfile.
- s Silent. No output is printed.
- d Run moshell in sql mode. Only applicable when first argument is a directory ("dumpdir")
- r Recursive folder search. Only applicable when first argument is a directory ("dumpdir").
Examples:
mobatch -p 15 -t 60 ~/sitefiles/victoria-sites 'lt all ; get' mobatch 10.1.128.10 ./cmdfiles/kget.mos
mobatch 10.1.128.10,rnc34,rbs10,mgw1.ericsson.se ./cmdfiles/kget.mos
mobatch ./sitefiles/all-rbs.txt ./cmdfiles/do_healthCheck.mos mobatch -p 5 -t 1 ./sitefiles/all-rbs.txt 'cv cu ; rbs'
mobatch ./sitefiles/all-rnc.txt 'lt ^utrancell ; st cell' mobatch ./sitefiles/all-bsc.txt ~/bsc-commandfiles/ mobatch -v
security_method=2,sa_credential=~/sam.pbe,sa_password=oemas -p 20 ./all_mgw.txt 'hc'
mobatch -v ip_database=~/utran_network/ipdatabase ~/utran_network/ipdatabase 'lt all ; get '
mobatch modumpfolder/ 'str;std;sti;stv;inv' mobatch -r modumpfolder/ 'str;std;sti;stv;inv' mobatch -dr dbdatfolder/ dbc
