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script
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why do scripting
automated maintenance
automated reports
schedule when needed
What kind of command language
interpreted command language
How many shell script UNIX commands to preform a task
It can contain multiple commands
An executable premission and is in the path name. What do you write at the command prompt
$ myfile
If it had executable permission and is not in the path name, how do you specify the path
$ ./myfile
It does not have executable permission
$ sh myfile
To make it an executable file
for everyone
a
for the owner
u
for the group
g
others outside the group
o
File permissions
read
r
write
w
execute
x
none
-
permissions can be
added
+
denied
-
explicitly set
=
to view current permissions
ls -l
to change premissions
chmod
All programs including scripts can be written using a combination of 3 structures.
Sequence
execute the commands in order
selection
if then or if then else statements
test for a criteria
looping
repeat a set of instructions, until the criteria is met and number of times
cat -n
the files with line numbers
in the file what does this mean #
Its a comment line and not executed
what does command display
date
current date and time
pwd
current working directory
wc
count words lines and characters
cp
copy a file
echo"any text"
displays the info after the echo
echo "no text"
makes blank line
read var1 [var2 var3]
accepts the keyboard data and places it in one or more
variables
how to use data in a variable
$var1
exit[number]
end of the program and stop it
can assign error code of 0 means successful
what is a variable
a memory location that has a name and stores a piece of data called a value
can store text, number or other type of data
can a variable be changed in a script as it runs
yes
what is iggnored by unix
#
Run the script and save the data in a file, overwriting any data already in the file
$ sh won3> capturefile
•Run the script and save the data in a file, appending the data at the end of any data already in the file
$ sh won3>> capturefile
•Run the script, display the data to the screen and save the data in a file, overwriting any data already in the file
$ sh won3 | tee capturefile
when running $ sh box 10 20 each is assigned a variable number
$ is value box
$1 is vlue 10
reads commands but doesn’t execute them
sh -n
shows the shell input lines as they are read
sh -v
shows the commands and their arguments as they are executed
sh -x
Author
Tjr31
ID
52560
Card Set
script
Description
part 1
Updated
2010-12-01T04:27:38Z
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