John Siu Blog

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echo ${PWD##*/}

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if [ "$str" = "string" ]; then ...

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if [[ ${A} = 3 ]]; then echo yes; fi

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STR="Line 1
Line2"

# This will output all in one line
echo $STR
Line 1 Line 2

# Use ""
echo "$STR"
Line 1
Line 2

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$ a=b/c/d/e
$ echo ${a#*/}
c/d/e

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$ a=b/c/d/e
$ echo ${a##*/}
e

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$ a=b/c/d/e
$ echo ${a%/*}
b/c/d

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$ a=b/c/d/e
$ echo ${a%%/*}
b

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a="This is a test."
b=" is a "
c=" is not a "
d=${a/$b/$c}
echo ${d}
This is not a test.

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   0123
a="This"
echo ${a:2}
is

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a=1
((a=a+1))
echo $a
2

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file=test.txt
while IFS= read -r line; do
...
done <${file}

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VAR="line 1
line 2
line 3"

while IFS= read -r LINE; do
	echo ${LINE}
done <<<"${VAR}"