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How does zsh expand variables before passing to programs?
Expanding variables in zshGlobbing with brackets and variables in zshzsh - fully expand binary path on <tab>Expand variable in function definition in zshHow can I expand all variables at the command line in Zsh?Expand parameter in quotes in zshOn passing arguments to programs through array variableszsh, expand * to (a|b|c)Why does $((0.1)) expand to 0.10000000000000001 in zsh?Expand alias in ZSH history
.everyoneloves__top-leaderboard:empty,.everyoneloves__mid-leaderboard:empty,.everyoneloves__bot-mid-leaderboard:empty{ margin-bottom:0;
}
A basic rule of zsh is that you don't need to quote your variables, for example:
% data="single argument"
% print -l $data
single argument
One exception I know of is that if an argument must not be skipped even if empty, it must be double quoted:
% emptyarg=
% functon count() { echo $# }
% count $emptyarg
0
% count "$emptyarg"
1
However, if an argument contains certain special characters, it must be quoted or the shell gives an error. Why is that? It seems fragile. The content of my data shouldn't substantially influence how functions/commands run.
zsh parameter
asked 1 hour ago
piojopiojo
1011
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add a comment |
A basic rule of zsh is that you don't need to quote your variables, for example:
% data="single argument"
% print -l $data
single argument
One exception I know of is that if an argument must not be skipped even if empty, it must be double quoted:
% emptyarg=
% functon count() { echo $# }
% count $emptyarg
0
% count "$emptyarg"
1
However, if an argument contains certain special characters, it must be quoted or the shell gives an error. Why is that? It seems fragile. The content of my data shouldn't substantially influence how functions/commands run.
zsh parameter
asked 1 hour ago
piojopiojo
1011
New contributor
piojo 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 |
A basic rule of zsh is that you don't need to quote your variables, for example:
% data="single argument"
% print -l $data
single argument
One exception I know of is that if an argument must not be skipped even if empty, it must be double quoted:
% emptyarg=
% functon count() { echo $# }
% count $emptyarg
0
% count "$emptyarg"
1
However, if an argument contains certain special characters, it must be quoted or the shell gives an error. Why is that? It seems fragile. The content of my data shouldn't substantially influence how functions/commands run.
zsh parameter
asked 1 hour ago
piojopiojo
1011
New contributor
piojo is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
A basic rule of zsh is that you don't need to quote your variables, for example:
% data="single argument"
% print -l $data
single argument
One exception I know of is that if an argument must not be skipped even if empty, it must be double quoted:
% emptyarg=
% functon count() { echo $# }
% count $emptyarg
0
% count "$emptyarg"
1
However, if an argument contains certain special characters, it must be quoted or the shell gives an error. Why is that? It seems fragile. The content of my data shouldn't substantially influence how functions/commands run.
zsh parameter
zsh parameter
asked 1 hour ago
piojopiojo
1011
New contributor
piojo is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
asked 1 hour ago
piojopiojo
1011
New contributor
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asked 1 hour ago
piojopiojo
1011
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asked 1 hour ago
piojopiojo
1011
asked 1 hour ago
piojopiojo
1011
1011
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I noticed the behavior works as expected in scripts (parameters don't expand, even without quotes). I realized the issue was probably caused by an option, so I ran setopt in my interactive shell and in a script and compared the results. I turned them off one by one until I found setopt noglobsubst had the desired effect. In short, the GLOB_SUBST option makes zsh treat all variables as patterns to be expanded if possible. You can disable this option and still expand variables when needed with the tilde ~ parameter expansion:
% setopt noglobsubst
% star=*
% echo $star
*
% echo $~star
readme.txt test.sh
answered 1 hour ago
piojopiojo
1011
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is theglobsubstoption on by default?
– Uncle Billy
54 mins ago
add a comment |
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1 Answer
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1 Answer
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I noticed the behavior works as expected in scripts (parameters don't expand, even without quotes). I realized the issue was probably caused by an option, so I ran setopt in my interactive shell and in a script and compared the results. I turned them off one by one until I found setopt noglobsubst had the desired effect. In short, the GLOB_SUBST option makes zsh treat all variables as patterns to be expanded if possible. You can disable this option and still expand variables when needed with the tilde ~ parameter expansion:
% setopt noglobsubst
% star=*
% echo $star
*
% echo $~star
readme.txt test.sh
answered 1 hour ago
piojopiojo
1011
New contributor
piojo is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
is theglobsubstoption on by default?
– Uncle Billy
54 mins ago
add a comment |
I noticed the behavior works as expected in scripts (parameters don't expand, even without quotes). I realized the issue was probably caused by an option, so I ran setopt in my interactive shell and in a script and compared the results. I turned them off one by one until I found setopt noglobsubst had the desired effect. In short, the GLOB_SUBST option makes zsh treat all variables as patterns to be expanded if possible. You can disable this option and still expand variables when needed with the tilde ~ parameter expansion:
% setopt noglobsubst
% star=*
% echo $star
*
% echo $~star
readme.txt test.sh
answered 1 hour ago
piojopiojo
1011
New contributor
piojo is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
is theglobsubstoption on by default?
– Uncle Billy
54 mins ago
add a comment |
I noticed the behavior works as expected in scripts (parameters don't expand, even without quotes). I realized the issue was probably caused by an option, so I ran setopt in my interactive shell and in a script and compared the results. I turned them off one by one until I found setopt noglobsubst had the desired effect. In short, the GLOB_SUBST option makes zsh treat all variables as patterns to be expanded if possible. You can disable this option and still expand variables when needed with the tilde ~ parameter expansion:
% setopt noglobsubst
% star=*
% echo $star
*
% echo $~star
readme.txt test.sh
answered 1 hour ago
piojopiojo
1011
New contributor
piojo is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
I noticed the behavior works as expected in scripts (parameters don't expand, even without quotes). I realized the issue was probably caused by an option, so I ran setopt in my interactive shell and in a script and compared the results. I turned them off one by one until I found setopt noglobsubst had the desired effect. In short, the GLOB_SUBST option makes zsh treat all variables as patterns to be expanded if possible. You can disable this option and still expand variables when needed with the tilde ~ parameter expansion:
% setopt noglobsubst
% star=*
% echo $star
*
% echo $~star
readme.txt test.sh
answered 1 hour ago
piojopiojo
1011
New contributor
piojo is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
answered 1 hour ago
piojopiojo
1011
New contributor
piojo is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
answered 1 hour ago
piojopiojo
1011
answered 1 hour ago
piojopiojo
1011
1011
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is theglobsubstoption on by default?
– Uncle Billy
54 mins ago
add a comment |
is theglobsubstoption on by default?
– Uncle Billy
54 mins ago
is the
globsubst option on by default?– Uncle Billy
54 mins ago
is the
globsubst option on by default?– Uncle Billy
54 mins ago
add a comment |
piojo is a new contributor. Be nice, and check out our Code of Conduct.
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