Why isn't tilde expansion performed on the input to read?
Why has tilde expansion not occurred in the output of this script?
#!/bin/bash
read -p "Enter filename: " fname
if [[ -d $fname ]]
then
echo "$fname is a directory"
else
echo "$fname is not a directory"
fi
Output:
$ bash -x test_cd.sh
+ read -p 'Enter filename: ' fname
Enter filename: ~/Music
+ [[ -d ~/Music ]]
+ echo ' ~/Music is not a directory'
~/Music is not a directory
command-line bash scripts
edited Nov 18 at 14:12
Zanna
50k13131238
asked Nov 18 at 7:11
jestadi
335
add a comment |
Why has tilde expansion not occurred in the output of this script?
#!/bin/bash
read -p "Enter filename: " fname
if [[ -d $fname ]]
then
echo "$fname is a directory"
else
echo "$fname is not a directory"
fi
Output:
$ bash -x test_cd.sh
+ read -p 'Enter filename: ' fname
Enter filename: ~/Music
+ [[ -d ~/Music ]]
+ echo ' ~/Music is not a directory'
~/Music is not a directory
command-line bash scripts
edited Nov 18 at 14:12
Zanna
50k13131238
asked Nov 18 at 7:11
jestadi
335
add a comment |
Why has tilde expansion not occurred in the output of this script?
#!/bin/bash
read -p "Enter filename: " fname
if [[ -d $fname ]]
then
echo "$fname is a directory"
else
echo "$fname is not a directory"
fi
Output:
$ bash -x test_cd.sh
+ read -p 'Enter filename: ' fname
Enter filename: ~/Music
+ [[ -d ~/Music ]]
+ echo ' ~/Music is not a directory'
~/Music is not a directory
command-line bash scripts
edited Nov 18 at 14:12
Zanna
50k13131238
asked Nov 18 at 7:11
jestadi
335
Why has tilde expansion not occurred in the output of this script?
#!/bin/bash
read -p "Enter filename: " fname
if [[ -d $fname ]]
then
echo "$fname is a directory"
else
echo "$fname is not a directory"
fi
Output:
$ bash -x test_cd.sh
+ read -p 'Enter filename: ' fname
Enter filename: ~/Music
+ [[ -d ~/Music ]]
+ echo ' ~/Music is not a directory'
~/Music is not a directory
command-line bash scripts
command-line bash scripts
edited Nov 18 at 14:12
Zanna
50k13131238
asked Nov 18 at 7:11
jestadi
335
edited Nov 18 at 14:12
Zanna
50k13131238
asked Nov 18 at 7:11
jestadi
335
edited Nov 18 at 14:12
Zanna
50k13131238
edited Nov 18 at 14:12
Zanna
50k13131238
edited Nov 18 at 14:12
Zanna
50k13131238
50k13131238
asked Nov 18 at 7:11
jestadi
335
asked Nov 18 at 7:11
jestadi
335
asked Nov 18 at 7:11
jestadi
335
335
add a comment |
add a comment |
1 Answer
1
active
oldest
votes
That’s simply because read doesn’t perform tilde expansion before saving the string, neither is it performed on a variable content later. You can use $HOME instead and enter
$HOME/Music
or let the script test for ~/ and replace it (taken from this answer):
case "$fname" in "~/"*)
fname="${HOME}/${x#"~/"}"
esac
You can also use bash Parameter Expansion to replace ~/ with $HOME at the beginning of the string:
if [[ -d ${fname/#~//$HOME/} ]]
This variable is expanded before the substitution is performed.
answered Nov 18 at 7:48
dessert
22k56198
add a comment |
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1 Answer
1
active
oldest
votes
1 Answer
1
active
oldest
votes
active
oldest
votes
active
oldest
votes
That’s simply because read doesn’t perform tilde expansion before saving the string, neither is it performed on a variable content later. You can use $HOME instead and enter
$HOME/Music
or let the script test for ~/ and replace it (taken from this answer):
case "$fname" in "~/"*)
fname="${HOME}/${x#"~/"}"
esac
You can also use bash Parameter Expansion to replace ~/ with $HOME at the beginning of the string:
if [[ -d ${fname/#~//$HOME/} ]]
This variable is expanded before the substitution is performed.
answered Nov 18 at 7:48
dessert
22k56198
add a comment |
That’s simply because read doesn’t perform tilde expansion before saving the string, neither is it performed on a variable content later. You can use $HOME instead and enter
$HOME/Music
or let the script test for ~/ and replace it (taken from this answer):
case "$fname" in "~/"*)
fname="${HOME}/${x#"~/"}"
esac
You can also use bash Parameter Expansion to replace ~/ with $HOME at the beginning of the string:
if [[ -d ${fname/#~//$HOME/} ]]
This variable is expanded before the substitution is performed.
answered Nov 18 at 7:48
dessert
22k56198
add a comment |
That’s simply because read doesn’t perform tilde expansion before saving the string, neither is it performed on a variable content later. You can use $HOME instead and enter
$HOME/Music
or let the script test for ~/ and replace it (taken from this answer):
case "$fname" in "~/"*)
fname="${HOME}/${x#"~/"}"
esac
You can also use bash Parameter Expansion to replace ~/ with $HOME at the beginning of the string:
if [[ -d ${fname/#~//$HOME/} ]]
This variable is expanded before the substitution is performed.
answered Nov 18 at 7:48
dessert
22k56198
That’s simply because read doesn’t perform tilde expansion before saving the string, neither is it performed on a variable content later. You can use $HOME instead and enter
$HOME/Music
or let the script test for ~/ and replace it (taken from this answer):
case "$fname" in "~/"*)
fname="${HOME}/${x#"~/"}"
esac
You can also use bash Parameter Expansion to replace ~/ with $HOME at the beginning of the string:
if [[ -d ${fname/#~//$HOME/} ]]
This variable is expanded before the substitution is performed.
answered Nov 18 at 7:48
dessert
22k56198
edited Nov 18 at 16:50
answered Nov 18 at 7:48
dessert
22k56198
answered Nov 18 at 7:48
dessert
22k56198
answered Nov 18 at 7:48
dessert
22k56198
22k56198
add a comment |
add a comment |
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