Complete this assignment by downloading this HTML file and editing it (using a text editor---not a special HTML editor). Wherever you see emphasized text (e.g. "Your name" and "Your Student Number" above) you should insert your own text, as appropriate. Submit via D2L by 5:00 p.m. on Wednesday, March 9.
Examine the Wikipedia article on process identifiers. What is special about the process on Linux whose PID is 1?
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Briefly describe the following ps aux
headings:
USER
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%CPU
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VSZ
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TTY
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TIME
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Briefly describe the load averages displayed by
top
.
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In Bash, what is the difference between a foreground process and a background process.
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When using the kill
command, what is the
difference between the KILL
and TERM
signals?
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Write a Bash script that produces:
Hello Your Name,
Please return, 'late book', before Tuesday.
Library Staff
when run with:
$ ./late.sh "Your Name" "late book" Tuesday
Provide your source code below.
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The following wc
command
$ wc -c < foo
38
outputs 38
if foo
contains
38
characters.
The output of the command above can be captured by:
$ c1=$(wc -c < foo)
Using a modification of the strategy above and arithmetic shell expansion, write a script that counts the number of characters in three files. Running the following script should produce
$ ./count3.sh foo bar foo
86
assuming foo
has 38
characters and
bar
has 10 characters.
Give the code for count3.sh
.
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A listing of the directory foo
with the command
ls -FR foo
produces:
foo:
one/ three/ two/
foo/one:
xx/
foo/one/xx:
foo/three:
foo/two:
yy/
foo/two/yy:
Write a script, called createdir.sh
, that
produces the above directory tree when run with:
$ ./createdir.sh foo xx yy
Provide the code for createdir.sh
below:
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Write a script that generates the following report when run
with ./rgb_freq.sh filename
'filename' has 4 occurrences of red
'filename' has 0 occurrences of green
'filename' has 7 occurrences of blue
Assuming filename
contains red
4
times and blue
7 times.
Provide the code for rgb_freq.sh
below.
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