How To Look Like A UNIX Guru

12 Sep 14

Zahid Sharif

linux

09 Sep 14

Jerry Horton

unix

06 Jun 14

zotero

06 Jan 14

zzanghwi

UNIX is based upon the idea of a stream
Everything is a stream, or appears to be.
ls > /dev/null # ignore output of ls
# ignore output of ls
process stdin and send results to stdout.
$ ls -l | grep Aug | wc -l
$ apropos checksum
~username
~parrt is my home directory,
it is how your shell session is initialized including your ever-important CLASSPATH environment variable.
.bash_profile
644 is a common wor
value file
Translating streams
processes on your box in action, use top.
tr, sed, and awk.
$ cat /home/public/cs601/unix/names | tr ' ' ' '
tr -s ' '.
C file to UNIX,
tr -d '\r'.
dropping or translating single character
grep.
prints matching lines to stdout.
particular character sequence in a set of files.
$ ... | sed 's/scott//g'
... | sed 's/view.jsp/index.jsp/'
```
$ ... | sed 's/$.*$.asp/\1.jsp/' 
```
Be careful to enclose the expression in single quotes so the command-line expansion doesn't modify the argument.

$ ... | sed 's/,.*$//' # kill from comma to end of line

columns of data or execute a little bit of code for each line matching a pattern
pattern-action pairs
awk thinks input lines are broken up into fields (i.e., columns) separate by whitespace
If you omit the pattern, the action is executed for each input line.
Omitting the action means print the line.
aasghar
har, Ali wchen Chen, Wei zchen Chen, Zhen-Jian
cat /home/public/cs601/unix/emails.txt | \ awk '{printf("%s %s ", $3, $2);}' | \ tr -d ','
where END is a special pattern that means "after processing the stream."
```
sort | \   uniq 
```
tar cvf /tmp/parrt.backup.tar parrt
tar untars things in the current directory!

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ystem, processing log files, and generally automating as much as possible.

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$ ls -l | grep Aug | wc -l # line count$ apropos checksum # help search$ grep -v '/images' # -v ignore$ tr -d '\r' # To convert a PC file to UNIX$ ... | sed 's/,.*$//' # kill from comma to end of line$ awk '{n+=$1;} ; END {print n;}' < /home/public/cs6

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