jammy (7) elvish-unix.7.gz

Introduction

       The unix: module provides access to features that only make sense on UNIX-like operating systems, such as
       Linux, FreeBSD, and macOS.

       On non-UNIX operating systems, such as MS Windows, this namespace does not exist and use unix will  fail.
       Use the $platform:is-unix variable to determine if this namespace is usable.

Variables

   $unix:umask {#unix:umask}
       The  file  mode  creation mask.  Its value is a string in Elvish octal representation; e.g.  0o027.  This
       makes it possible to use it in any context that expects a $number.

       When assigning a new value a string is implicitly treated as an octal number.  If that  fails  the  usual
       rules for interpreting numbers are used.  The following are equivalent: unix:umask = 027 and unix:umask =
       0o27.  You can also assign to it a float64 data type that has  no  fractional  component.   The  assigned
       value must be within the range [0 ... 0o777], otherwise the assignment will throw an exception.

       You  can  do  a temporary assignment to affect a single command; e.g.  umask=077 touch a_file.  After the
       command completes the old umask will be restored.   Warning:  Since  the  umask  applies  to  the  entire
       process,  not  individual  threads,  changing it temporarily in this manner is dangerous if you are doing
       anything in parallel.  Such as via the peach command.