Running a Test with expression in a string
Multi tool use
Clash Royale CLAN TAG#URR8PPP
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I am trying to run the test command from a string. The string contains the expression.
TEST="! -e ~/bin/xyz"
if [ `echo "$TEST"` ]; then
echo running "$TEST";
fi
However, the above if condition does evaluate to true but if I plug in the command directly (as below), it evaluates to false.
if [ ! -e ~/bin/xyz ]; then
echo running;
fi
The second snippet's behavior is correct. Can someone help me understand why there is a difference and also how I can correct the first snippet to give me the right result?
linux test
asked 7 mins ago
Ashwin
1
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Ashwin is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
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up vote
0
down vote
favorite
I am trying to run the test command from a string. The string contains the expression.
TEST="! -e ~/bin/xyz"
if [ `echo "$TEST"` ]; then
echo running "$TEST";
fi
However, the above if condition does evaluate to true but if I plug in the command directly (as below), it evaluates to false.
if [ ! -e ~/bin/xyz ]; then
echo running;
fi
The second snippet's behavior is correct. Can someone help me understand why there is a difference and also how I can correct the first snippet to give me the right result?
linux test
asked 7 mins ago
Ashwin
1
New contributor
Ashwin is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
add a comment |Â
up vote
0
down vote
favorite
up vote
0
down vote
favorite
I am trying to run the test command from a string. The string contains the expression.
TEST="! -e ~/bin/xyz"
if [ `echo "$TEST"` ]; then
echo running "$TEST";
fi
However, the above if condition does evaluate to true but if I plug in the command directly (as below), it evaluates to false.
if [ ! -e ~/bin/xyz ]; then
echo running;
fi
The second snippet's behavior is correct. Can someone help me understand why there is a difference and also how I can correct the first snippet to give me the right result?
linux test
asked 7 mins ago
Ashwin
1
New contributor
Ashwin is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
I am trying to run the test command from a string. The string contains the expression.
TEST="! -e ~/bin/xyz"
if [ `echo "$TEST"` ]; then
echo running "$TEST";
fi
However, the above if condition does evaluate to true but if I plug in the command directly (as below), it evaluates to false.
if [ ! -e ~/bin/xyz ]; then
echo running;
fi
The second snippet's behavior is correct. Can someone help me understand why there is a difference and also how I can correct the first snippet to give me the right result?
linux test
linux test
asked 7 mins ago
Ashwin
1
New contributor
Ashwin is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
asked 7 mins ago
Ashwin
1
New contributor
Ashwin is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
asked 7 mins ago
Ashwin
1
New contributor
Ashwin is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
asked 7 mins ago
Ashwin
1
asked 7 mins ago
Ashwin
1
1
New contributor
Ashwin is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
New contributor
Ashwin is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
Ashwin is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
add a comment |Â
add a comment |Â
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Ashwin is a new contributor. Be nice, and check out our Code of Conduct.
Ashwin is a new contributor. Be nice, and check out our Code of Conduct.
Ashwin is a new contributor. Be nice, and check out our Code of Conduct.
Ashwin is a new contributor. Be nice, and check out our Code of Conduct.
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