Display lines, with line numbers, records of CS majors.
Display lines, with line numbers, for students whose first name is John.
Display lines, with line numbers, for students whose first or last name is Lee.
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Shell Script: Pick one of the grep commands that you created above. Put that grep command in a shell script. The name of the shell script is your choice. Run the shell script.
Turn in the contents of the shell script and the output of the shell script run.
I am obviously not finding the information I need and need the help figuring it out
Waubonsee Community College
Sugar Grove Illinois
Professor: Tim Lippold
Linux/UNIX Operating System CIS180
Book being used is Harley Hahn's Guide to Unix and Linux
---------- Post updated at 08:24 PM ---------- Previous update was at 03:35 PM ----------
Yes the ^ is the "beginning of the line" anchor.
Then you do not need the other \< "left word boundary" anchor.
But the \> "right word boundary" is useful so it does not match Johnny.
Even better would be the field separator, then it would not even match John-Mary. The field separator is the character : (or in the case of "space" a character set that consists of a character class [[:space:]].
For your challenge "above 3.69 below 4.0" match a 3 then a dot then a character set 7-9. Assuming that there is not a further decimal digit e.g. 3.699
Often forgotten: in a regular expression a plain . is an "any character" wildcard, so in order to match a literal dot you need to escape it \. or put it in a character set [.]
Last edited by MadeInGermany; 11-24-2017 at 03:54 AM..
Look also at your book's description of basic regular expressions (BREs) for:
anchors (^ and $),
non-matching list bracket expressions ([^list]),
subexpressions (\(BRE\)),
repetition of expressions (*), and
interval expressions (BRE\{min,max\} and BRE\{count\}).
Can you combine the above concepts to produce a BRE that is anchored to the start of a line (matches zero or more occurrences of characters that are not your field delimiter followed by your field delimiter) a specific number of times to skip over the contents of a specific number of fields at the start of a line?
For example, what do you think the BRE in the following grep command will match?
Code:
grep -n '^\([^:]*:\)\{4\}[^:]*\.edu:' smallFile
Try running that command. Did it print the lines you expected it to print?
What do you think the BRE in the following grep command will match?
Code:
grep -n '1$' smallFile
What happens if you combine the above two commands in a pipeline?
Does one of the above two suggestions provide a logical OR of the two BREs? Does one of the above two suggestions provide a logical AND of the two BREs?
now that I have been up about 20 trying to figure this out I can get some sleep now that I figure the 6 out next is shell script to be done when I wake up
I am a student in a UNIX/Linux classes having hard time with grep looking for assistance on some home work
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