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Full Discussion: Add Variable in .bash_profile
Top Forums Shell Programming and Scripting Add Variable in .bash_profile Post 302524578 by mirni on Tuesday 24th of May 2011 01:28:33 AM
Old 05-24-2011
This sed command inserts (i) a line 'IMPACT_HOME=/my/new/path' before every line in infile; which is almost certainly not what you want.
You may want to make #1 look like:
Code:
grep -q IMPACT_HOME infile || sed '$ a IMPACT_HOME=/my/new/path' infile

which will append (a) the line at the end of file ($).

#2 is a little trickier. I think the intention was to substitute the definition of IMAPCT_HOME with a new path, however, this is a not quite well designed solution. The sed command there will replace any occurence of IMPACT_HOME until the end of line with 'IMPACT_HOME=/my/new/path'.
But what if infile contains some other statements containing IMPACT HOME, that are not a definition of it? E.g.:
Code:
if [ -z "$IMPACT_HOME" ] ; then 
 #do something
fi

would change into
Code:
if [ -z "$IMPACT_HOME=/my/new/path
 #do something
fi

and create syntax error(s).
I'd write #2 like this:
Code:
grep -q IMPACT_HOME infile && sed -i 's!^\([^#]*IMPACT_HOME=\)\(.*\)!\1/my/new/path #\2!' infile

Which will change the first line containing 'IMPACT_HOME='.
It will put the old definition (string after equal sign) into a comment on the same line. So, e.g. line:
Code:
IMPACT_HOME=/old/path

will become
Code:
IMPACT_HOME=/my/new/path #/old/path

It will only change (at most) one line (no 'g' at the end); and it will not change lines containing pound symbol before IMPACT_HOME (comments).

#1 and #2 can actually be put together into one (albeit long) line:
Code:
grep -q IMPACT_HOME infile && sed -i 's!^\([^#]*IMPACT_HOME=\)\(.*\)!\1/my/new/path #\2!' infile || sed '$ a IMPACT_HOME=/my/new/path' infile

 

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LEARN ABOUT OPENSOLARIS

ppmtosixel

ppmtosixel(1)                                                 General Commands Manual                                                ppmtosixel(1)

NAME

       ppmtosixel - convert a portable pixmap into DEC sixel format

SYNOPSIS

       ppmtosixel [-raw] [-margin] [ppmfile]

DESCRIPTION

       Reads  a  portable  pixmap  as input.  Produces sixel commands (SIX) as output.  The output is formatted for color printing, e.g. for a DEC
       LJ250 color inkjet printer.

       If RGB values from the PPM file do not have maxval=100, the RGB values are rescaled.  A printer control header and a color assignment table
       begin the SIX file.  Image data is written in a compressed format by default.  A printer control footer ends the image file.

OPTIONS

       -raw   If  specified,  each  pixel  will  be explicitly described in the image file.  If -raw is not specified, output will default to com-
              pressed format in which identical adjacent pixels are replaced by "repeat pixel" commands.  A raw file is often an order  of  magni-
              tude larger than a compressed file and prints much slower.

       -margin
              If  -margin  is not specified, the image will be start at the left margin (of the window, paper, or whatever).  If -margin is speci-
              fied, a 1.5 inch left margin will offset the image.

PRINTING

       Generally, sixel files must reach the printer unfiltered.  Use the lpr -x option or cat filename > /dev/tty0?.

BUGS

       Upon rescaling, truncation of the least significant bits of RGB values may result in poor color conversion.  If the original PPM maxval was
       greater  than  100,  rescaling  also reduces the image depth.  While the actual RGB values from the ppm file are more or less retained, the
       color palette of the LJ250 may not match the colors on your screen.  This seems to be a printer limitation.

SEE ALSO

       ppm(5)

AUTHOR

       Copyright (C) 1991 by Rick Vinci.

                                                                   26 April 1991                                                     ppmtosixel(1)
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