maggicl
/
theshell.ch
1
0
Fork 0
Code Issues Pull Requests Projects Releases Wiki Activity

Fixed some typos in while and for pages 

git-svn-id: svn+ssh://atelier.inf.usi.ch/home/bevilj/group-1@223 a672b425-5310-4d7a-af5c-997e18724b81
This commit is contained in:
omenem 2018-11-15 21:28:20 +00:00
parent 986c652fa1
commit d25b163817
1 changed files with 8 additions and 8 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

16
site/pages/scripts/while-loop.html
View File

@ -41,10 +41,10 @@ done
{% endhighlight %}
In this first example, you simply create a variable called i and evaluate it to 0.
Then you access the while loop: the condition <code> [$i -lt 4] </code> means that this while
loop will run until the <code> i </code> variable is less than 4.
Every cycle of this loop, you print out the value of variable i with <code> echo $i </code>
and finally, you increase its value by 1 with <code> i=$((i + 1)) </code>.
Then you access the while loop: the condition <code> [$i -lt 4]</code> means that this while
loop will run until the <code> i</code> variable is less than 4.
Every cycle of this loop, you print out the value of variable i with <code> echo $i</code>
and finally, you increase its value by 1 with <code> i=$((i + 1))</code>.
Therefore in 4 cycles the value of i will be 4. This will make the condition of the while loop false.
The output of this piece of code is:
<pre>
@ -80,9 +80,9 @@ done
No termination condition is set for this loop in this example. This type of loop
is called infinite loop.<br>
The <code> exit </code> statement is used to quit the loop. This loop will
The <code> exit</code> statement is used to quit the loop. This loop will
iterate for 9 times, then
as soon as <code> i </code> becomes equal to 0, the condition of the last if
as soon as <code> i</code> becomes equal to 0, the condition of the last if
statement will evaluate to true and the loop will be terminated. <br>
The output of this piece of code is:
@ -124,11 +124,11 @@ done &lt; "$file"
{% endhighlight %}
The <code> read </code> command is used to read a file line by line.
The flag <code> -r </code> is used to tell the
The flag <code> -r</code> is used to tell the
command read to interpret backslashes (/) literally, instead as escape characters.
This command, expect for some few
rare cases, should always be used with this flag.
In this example, <code> &lt; "$file" </code> redirects the loop's input from a file
In this example, <code> &lt; "$file"</code> redirects the loop's input from a file
whose name is stored in a variable.
This file has 3 columns, <code> first_name last_name phone </code>, separated by
blank space (or a tab).