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IO
Values for variables can be read from stdin of form a file:
<![CDATA[
#!/bin/sh
# Read from stdin:
echo "Hi there"
echo "what is your name? (Type your name here and press Enter)"
read NM
echo "Hello $NM"
# Read from data file:
echo "Numbers are in one line space separated:"
read a b c < data_file
echo a = $a
echo b = $b
echo c = $c
echo "Numbers are stored one per line:"
{
read a
read b
read c
} < data_file
echo a = $a
echo b = $b
echo c = $c
]]>
Test in shell:
<![CDATA[
~/tmp> more data_file
1 2 45
33
44
~/tmp> sh t
Hi there
what is your name? (Type your name here and press Enter)
Felix
Hello Felix
Numbers are in one line space separated:
a = 1
b = 2
c = 45
Numbers are stored one per line:
a = 1 2 45
b = 33
c = 44
]]>