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some sytem scripts

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Marina Wahl 2014-07-05 18:22:01 -04:00
parent 4b0a965e4a
commit 5852171b21
25 changed files with 639 additions and 1 deletions
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12
shell_scripts/lessons/file_descriptors.sh Executable file
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#!/bin/sh
# from > & destination
if [ $# -ne 2 ]
then
echo "Error!" 1>&2
echo "Usae: $0 number1 number2"
exit 1
fi
ans=`expr $1 + $2`
echo "Sum = $ans"