Shellscript Tricks

RGB Color Table
Red	Green	Blue	Color
`0`	`0`	`0`	black
`1`	`1`	`1`	white
`1`	`0`	`0`	red
`0`	`1`	`0`	green
`0`	`0`	`1`	blue
`1`	`1`	`0`	yellow
`1`	`0`	`1`	magenta
`0`	`1`	`1`	cyan
`0.5`	`0.5`	`0.5`	gray
`0.5`	`0`	`0`	dark red
`1`	`0.62`	`0.40`	copper
`0.49`	`1`	`0.83`	aquamarine

C Shell foreach

foreach event (figure5*.eps)
epstopdf $event
end

Note: process a bounch of files with the same pattern.

AWK subset

cat SHLK_2.loc | awk '$NF>3.0' > SHLK_3.loc

Note: subset a data ascii file with the last column larger than 3.0.

SED Tricks

 sed 's/[_a-zA-Z.]/ /g'

Note: replace any letter inside "[ ]" with space.

Vi: Search and Replace

Search (Wraped around at end of file):

  Search STRING forward :   / STRING.
  Search STRING backward:   ? STRING.

  Repeat search:   n
  Repeat search in opposite direction:  N  (SHIFT-n)

Replace: Same as with sed, Replace OLD with NEW:

 First occurrence on current line:      :s/OLD/NEW
  
 Globally (all) on current line:        :s/OLD/NEW/g 

 Between two lines #,#:                 :#,#s/OLD/NEW/g
  
 Every occurrence in file:              :%s/OLD/NEW/g

Last modified on Feb 25, 2009