1unix flags: man -[?] <search term> # find term in descriptsion of man pages,k,flags
 2unix flags: ls -[?] # show all files including hidden files,a,flags
 3# unix flags: ls -[?] #,l,flags
 4# unix flags: ls -[?] #,r,flags
 5# unix flags: ls -[?] #,t,flags
 6# unix flags: ls -[?] #,i,flags
 7unix flags: touch -[?] <reference file> FILE # use the reference file's times instead of the current time,r,flags
 8unix flags: touch -[?] FILE # only modify the access time of the file,a,flags
 9unix flags: touch -[?] FILE # only modify the modified time of the file,m,flags
10unix flags: touch -[?] STAMP FILE # use supplied timestamp instead of current time,t,flags
11# unix flags: find
12# unix flags: find
13# unix flags: find
14# unix flags: grep -r
15# unix flags: grep -R
16# unix flags: grep -E
17# unix flags: grep -F
18# unix flags: uniq -c
19# unix flags: sort -n
20# unix flags: wc -l
21# unix flags: kill -STOP <pid>
22# unix flags: kill -CONT <pid>
23# unix flags: kill -9 <pid>
24# unix flags: ps -a
25# unix flags: ps -u
26# unix flags: ps -x
27# unix flags: ps -e
28# unix flags: ps -f
29# unix flags: who -r