##### Looking at Files and Directories
pwd
- Show equivalent to my current home directory in Finder
ls
ls -A
ls -AG
ls -l
man ls
- reading, also searching (/ then n or N) and quitting (q)
- ~, ., ..
ls .
ls ..
ls ~
ls Desktop
ls ~/Desktop
ls /Users/presentation/Desktop

##### Changing directories
cd
cd ~, cd ., cd .., etc

##### Making Directories
mkdir
mkdir -p

##### Making files
touch
nano/pico

##### Removing files and directories
rm
rm -r
rm -rf

##### Copy and move
cp
cp -r
mv # to relocate
mv # to rename

##### Wildcards
file - info about file
file *
cd 506-f23/data
file recs20??_public*
- ? = one character, as opposed to in regexp, ? = 0 or 1
file [a-f]*
file [cf]*
# rm -rf * // remove all files in current directory
# mv images/*.png picutres/
# ls

##### Examining files
head
tail
head -n
tail -n
wc
wc -l
egrep (e.g. egrep MIA flights\tab)
- egrep over grep to support more regex
PS03 P3 a:
     egrep "\@[a-z]+\.net," us-500.csv
     wc -l us-500.csv

##### Piping
- Redirecting to and from files
wc -l chicago-nmmaps.csv > results
wc -l us-500.csv > results
wc -l chicago-nmmaps.csv > results
wc -l us-500.csv >> results
wc -l < results
- Redirecting to and from programs
ls | head -n 3