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Symbolic equivalent of chmod 400

problem with chmod commandautomatically set sudo chmod 777Understanding chmod Symbolic Notation and use of OctalWhat is the Ubuntu equivalent of OSX `chmod -h` flag?Incorrectly ran chmod 754Chmod -r issuesAfter doing chmod 400 on /usr the sudo command is not workingConfusion in chmod optionschmod 400 will not change the permissions of a fileCannot change file permission after chmod 400

.everyoneloves__top-leaderboard:empty,.everyoneloves__mid-leaderboard:empty,.everyoneloves__bot-mid-leaderboard:empty{ margin-bottom:0;
}

2

The following is often used to set file permissions, a good example being setting a key file to an appropriate permission level to be used by ssh (this being the "octal" form):

chmod 400 filename.xyz

Would it be a correct equivalent and acceptable practice to use the following instead (this is the "symbolic" form)?

chmod a=,u=r filename.xyz

The reason I ask is that it seems a bit clearer for code readability. Still not exactly human readable, but no bit mapping needed.

If maximum readibility (and not terseness) were the primary driver, would there be a better option?

permissions chmod

share|improve this question

asked 8 hours ago

GaTechThomasGaTechThomas

11122 bronze badges

add a comment | 

2

The following is often used to set file permissions, a good example being setting a key file to an appropriate permission level to be used by ssh (this being the "octal" form):

chmod 400 filename.xyz

Would it be a correct equivalent and acceptable practice to use the following instead (this is the "symbolic" form)?

chmod a=,u=r filename.xyz

The reason I ask is that it seems a bit clearer for code readability. Still not exactly human readable, but no bit mapping needed.

If maximum readibility (and not terseness) were the primary driver, would there be a better option?

permissions chmod

share|improve this question

asked 8 hours ago

GaTechThomasGaTechThomas

11122 bronze badges

add a comment | 

The following is often used to set file permissions, a good example being setting a key file to an appropriate permission level to be used by ssh (this being the "octal" form):

chmod 400 filename.xyz

Would it be a correct equivalent and acceptable practice to use the following instead (this is the "symbolic" form)?

chmod a=,u=r filename.xyz

The reason I ask is that it seems a bit clearer for code readability. Still not exactly human readable, but no bit mapping needed.

If maximum readibility (and not terseness) were the primary driver, would there be a better option?

permissions chmod

share|improve this question

asked 8 hours ago

GaTechThomasGaTechThomas

11122 bronze badges

chmod 400 filename.xyz

chmod a=,u=r filename.xyz

share|improve this question

asked 8 hours ago

GaTechThomasGaTechThomas

11122 bronze badges

share|improve this question

asked 8 hours ago

GaTechThomasGaTechThomas

11122 bronze badges

asked 8 hours ago

GaTechThomasGaTechThomas

11122 bronze badges

asked 8 hours ago

GaTechThomasGaTechThomas

11122 bronze badges

1 Answer
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4

With a=,u=r, the order is important. If you accidentally swap the order of a= and u=r (or the order of a= and u=), the result would be very different. (Yes, a and u are pretty far from each other on a QWERTY keyboard, but someone looking at a reference doc and manually typing things in might mess up between the two very similar looking parts.) For maximum readability and safety, I'd be more explicit:

chmod u=r,go-rwx filename # or go-rwxst

The permission components are very different here, and way more explicit, making mistakes less likely to happen. And it doesn't matter if you have go-rwx first or u=r first.

share|improve this answer

edited 6 hours ago

answered 8 hours ago

chmod a-rwxchmod a-rwx

4122 bronze badges

New contributor

chmod a-rwx is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  That makes a lot of sense.
  
  – GaTechThomas
  8 hours ago
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Did you mean "u=r" at the very end of the answer?
  
  – GaTechThomas
  8 hours ago
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  @GaTechThomas I did, thanks! Fixed the typo.
  
  – chmod a-rwx
  8 hours ago
  

  
  
  
  

add a comment | 

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4

With a=,u=r, the order is important. If you accidentally swap the order of a= and u=r (or the order of a= and u=), the result would be very different. (Yes, a and u are pretty far from each other on a QWERTY keyboard, but someone looking at a reference doc and manually typing things in might mess up between the two very similar looking parts.) For maximum readability and safety, I'd be more explicit:

chmod u=r,go-rwx filename # or go-rwxst

The permission components are very different here, and way more explicit, making mistakes less likely to happen. And it doesn't matter if you have go-rwx first or u=r first.

share|improve this answer

edited 6 hours ago

answered 8 hours ago

chmod a-rwxchmod a-rwx

4122 bronze badges

New contributor

chmod a-rwx is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  That makes a lot of sense.
  
  – GaTechThomas
  8 hours ago
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Did you mean "u=r" at the very end of the answer?
  
  – GaTechThomas
  8 hours ago
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  @GaTechThomas I did, thanks! Fixed the typo.
  
  – chmod a-rwx
  8 hours ago
  

  
  
  
  

add a comment | 

4

With a=,u=r, the order is important. If you accidentally swap the order of a= and u=r (or the order of a= and u=), the result would be very different. (Yes, a and u are pretty far from each other on a QWERTY keyboard, but someone looking at a reference doc and manually typing things in might mess up between the two very similar looking parts.) For maximum readability and safety, I'd be more explicit:

chmod u=r,go-rwx filename # or go-rwxst

The permission components are very different here, and way more explicit, making mistakes less likely to happen. And it doesn't matter if you have go-rwx first or u=r first.

share|improve this answer

edited 6 hours ago

answered 8 hours ago

chmod a-rwxchmod a-rwx

4122 bronze badges

New contributor

chmod a-rwx is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  That makes a lot of sense.
  
  – GaTechThomas
  8 hours ago
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Did you mean "u=r" at the very end of the answer?
  
  – GaTechThomas
  8 hours ago
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  @GaTechThomas I did, thanks! Fixed the typo.
  
  – chmod a-rwx
  8 hours ago
  

  
  
  
  

add a comment | 

With a=,u=r, the order is important. If you accidentally swap the order of a= and u=r (or the order of a= and u=), the result would be very different. (Yes, a and u are pretty far from each other on a QWERTY keyboard, but someone looking at a reference doc and manually typing things in might mess up between the two very similar looking parts.) For maximum readability and safety, I'd be more explicit:

chmod u=r,go-rwx filename # or go-rwxst

The permission components are very different here, and way more explicit, making mistakes less likely to happen. And it doesn't matter if you have go-rwx first or u=r first.

share|improve this answer

edited 6 hours ago

answered 8 hours ago

chmod a-rwxchmod a-rwx

4122 bronze badges

New contributor

chmod a-rwx is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.

chmod u=r,go-rwx filename # or go-rwxst

share|improve this answer

edited 6 hours ago

answered 8 hours ago

chmod a-rwxchmod a-rwx

4122 bronze badges

New contributor

chmod a-rwx is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.

answered 8 hours ago

chmod a-rwxchmod a-rwx

4122 bronze badges

New contributor

chmod a-rwx is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.

answered 8 hours ago

chmod a-rwxchmod a-rwx

4122 bronze badges