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Today we've done a couple of walkthroughs, and started regular expressions. There will be lots of walkthroughs on the exam!
Here are the ones we did in class:
walk1.sh:
<source lang="bash">#!/bin/bash
echo -n " Stuff: "
i=5
for ((i=10; i < 20; i++))
{
echo -n $i
}
echo .
</source>
walk2.sh:
<source lang="bash">
#!/bin/bash
cat passwd | while read ABC
do
N=`echo $ABC | cut -d: -f1`
S=`echo $ABC | cut -d: -f7`
echo "$N -> $S"
done
echo '$N -> $S'
</source>
For regular expressions we looked at egrep for searching, specifically the following special characters:
* ^ $ . *
And sed for search+replace. Sed is an important topic in this course, all that you need to learn about it is in the first few sections of [http://www.grymoire.com/Unix/Sed.html this tutorial]. By the end of the course you have to be comfortable at least with everything up to and including the "/p print" section.
Here are the ones we did in class:
walk1.sh:
<source lang="bash">#!/bin/bash
echo -n " Stuff: "
i=5
for ((i=10; i < 20; i++))
{
echo -n $i
}
echo .
</source>
walk2.sh:
<source lang="bash">
#!/bin/bash
cat passwd | while read ABC
do
N=`echo $ABC | cut -d: -f1`
S=`echo $ABC | cut -d: -f7`
echo "$N -> $S"
done
echo '$N -> $S'
</source>
For regular expressions we looked at egrep for searching, specifically the following special characters:
* ^ $ . *
And sed for search+replace. Sed is an important topic in this course, all that you need to learn about it is in the first few sections of [http://www.grymoire.com/Unix/Sed.html this tutorial]. By the end of the course you have to be comfortable at least with everything up to and including the "/p print" section.
