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copied!<p>The first thing to pop into my head to change just part of a string is a sed substitution.</p> <p>example: if echo $PATH => "/usr/pkg/bin:/usr/bin:/bin:/usr/pkg/games:/usr/pkg/X11R6/bin" then to change "/usr/bin" to "/usr/local/bin" could be done like this:</p> <p>## produces standard output file</p> <p>## the "=" character is used instead of slash ("/") since that would be messy, # alternative quoting character should be unlikely in PATH</p> <p>## the path separater character ":" is both removed and re-added here, # might want an extra colon after the last path</p> <p>echo $PATH | sed '=/usr/bin:=/usr/local/bin:='</p> <p>This solution replaces an entire path-element so might be redundant if new-element is similar.</p> <p>If the new PATH'-s aren't dynamic but always within some constant set you could save <em>those</em> in a variable and assign as needed:</p> <p>PATH=$TEMP_PATH_1; # commands ... ; \n PATH=$TEMP_PATH_2; # commands etc... ;</p> <p>Might not be what you were thinking. some of the relevant commands on bash/unix would be:</p> <p>pushd popd cd ls # maybe l -1A for single column; find grep which # could confirm that file is where you think it came from; env type</p> <p>..and all that and more have <em>some</em> bearing on PATH or directories in general. The text altering part could be done any number of ways!</p> <p>Whatever solution chosen would have 4 parts:</p> <p>1) fetch the path as it is 2) decode the path to find the part needing changes 3) determing what changes are needed/integrating those changes 4) validation/final integration/setting the variable</p>

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