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Top Forums UNIX for Dummies Questions & Answers Multiple Commands on a Single Line Post 302578354 by Corona688 on Thursday 1st of December 2011 10:48:17 AM
Old 12-01-2011
On some shells, you can do ${!VARNAME} to get the value of the name pointed to by VARNAME instead of the value of VARNAME itself. But this only works in certain shells.

In others you can do math or string operations on the day to get rid of the leading zero.

So, what's your system? What's your shell?

---------- Post updated at 09:48 AM ---------- Previous update was at 09:44 AM ----------

If you have BASH or ksh:

Code:
$ echo cmd var$((1$(date +%d) - 100))
cmd var1
$

The trickery with subtracting 100 is necessary because BASH will believe numbers starting with 0 to be octal, not decimal! So we cram a 1 on the front then subtract 100...
This User Gave Thanks to Corona688 For This Post:
 

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diff3(1)						      General Commands Manual							  diff3(1)

NAME
diff3 - 3-way differential file comparison SYNOPSIS
file1 file2 file3 DESCRIPTION
compares three versions of a file, and prints disagreeing ranges of text flagged with these codes: all three files differ file1 is different file2 is different file3 is different The type of change required to convert a given range of a given file to some other is indicated in one of these ways: Text is to be appended after line number n1 in file f, where f = or Text is to be changed in the range line n1 through line n2. If n1 = n2, the range can be abbreviated to n1. The original contents of the range follows immediately after a indication. When the contents of two files are identical, the contents of the lower-numbered file is suppressed. Produces a script for the editor that can be used to incorporate into file1 all changes between file2 and file3 (see ed(1)); i.e., the changes that normally would be flagged and Produces a script to incorporate only changes flagged Produces a script to incorporate only changes flagged Produces a script that will incorporate all changes between file2 and file3, but treat overlapping changes (that is, changes that would be flagged with in normal listing) differently. The overlapping lines in both files will be inserted by the edit script bracketed by and lines. Produces a script that will incorporate only changes flagged , but treat these changes in the manner of option. The following command applies the resulting script to file1. EXTERNAL INFLUENCES
International Code Set Support Single- and multi-byte character code sets are supported. WARNINGS
Text lines that consist of a single period defeat Files longer than 64K bytes do not work. FILES
SEE ALSO
diff(1). diff3(1)
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