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Shell Programming and Scripting

Directory path shortening ????

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# 1  
Old 08-12-2010
Question Directory path shortening ????
As it was a new topic i started a new thread.

There are different Directories under
Code:
"$HOME/rsh/Desktop/at/bin/bellhop/ and $HOME/rsh/Desktop/at/examples/"

i want to perform some operation like cp or mv

Is it possible to do

Code:
R=$HOME/rsh/Desktop/at/bin/bellhop/
P=$HOME/rsh/Desktop/at/examples/
S=$HOME/rsh/Desktop/at/results

(assuming there is a directory 'x' under bellhop/x/file1 and similarly 'y' under /examples/y/file2)

cat  $R/x/file1 $P/y/file2 >$S/xy/file3

as i will be executing several commands of this fashion, i would try to avoid writing such big lines, is there an alternative way to achieve this.
# 2  
Old 08-12-2010
The way you've got it will actually work. However I'd change it just a little bit:

Code:
R="${HOME}/rsh/Desktop/at/bin/bellhop/"
P="${HOME}/rsh/Desktop/at/examples/"
S=${HOME}/rsh/Desktop/at/results"

cat  "${R}/x/file1" "${P}/y/file2" > "${S}/xy/file3"

The double quotes let it properly handle directory names containing spaces, which might otherwise be split into multiple arguments unexpectedly. The brackets around the variables let it identify variables in otherwise-ambiguous situations like $R_not_a_variable.
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