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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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mewencode

MEWENCODE(1)                                                  General Commands Manual                                                 MEWENCODE(1)

NAME

       mewencode, mewdecode, mewcat - MIME encoder/decoder

SYNOPSIS

       mewencode [-options] [infile [outfile]]
       mewdecode [-options] [infile [outfile]]
       mewcat [-options] [infile]

DESCRIPTION

       The mewencode utility encode/decode MIME objects.

       The options are as follows:

       -e      Encoding.

       -d      Decoding.

       -8      See if any 8bit characters are contained.

       -b      MIME base64 en/decoding.

       -q      MIME quoted-printable en/decoding.

       -g      MIME gzip64 en/decoding(not yet specified in RFC).

       -z      The same as -g.

       -u      Uudecoding.

       -l length
               Line length into which base64/quoted-printable/gzip64 encoding truncate.

       -t      On  base64/gzip64  encoding,  local newline is treated as CRLF.  On base/gzip64 decoding, any newline is translated into local new-
               line.  Specify this option only when the input is a line based object(e.g. Content-Type: is text/plain or application/postscript).

       -h      Display this help message.

       -v      Display the version.

4th Berkeley Distribution                                         March 17, 2001                                                      MEWENCODE(1)
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