diff options
| -rw-r--r-- | doc/coreutils.texi | 49 |
1 files changed, 49 insertions, 0 deletions
diff --git a/doc/coreutils.texi b/doc/coreutils.texi index 0178f60c4..14ee3b0ba 100644 --- a/doc/coreutils.texi +++ b/doc/coreutils.texi @@ -1516,6 +1516,9 @@ or by explicitly calling @command{coreutils} with the coreutils @option{--coreutils-prog=PROGRAM} @dots{} @end example +The @command{coreutils} command is not installed by default, so +portable scripts should not rely on its existence. + @node Output of entire files @chapter Output of entire files @@ -11434,6 +11437,9 @@ Ignored; for compatibility with System V versions of @command{df}. @end table +@command{df} is installed only on systems that have usable mount tables, +so portable scripts should not rely on its existence. + @exitstatus Failure includes the case where no output is generated, so you can inspect the exit status of a command like @samp{df -t ext3 -t reiserfs @@ -13841,6 +13847,10 @@ systems, those or other settings also may not be available, but it's not feasible to document all the variations: just try it and see. +@command{stty} is installed only on platforms with the POSIX terminal +interface, so portable scripts should not rely on its existence on +non-POSIX platforms. + @exitstatus @menu @@ -14760,6 +14770,10 @@ that file instead. A common choice is @file{/var/log/wtmp}. The only options are @option{--help} and @option{--version}. @xref{Common options}. +The @command{users} command is installed only on platforms with the +POSIX @code{<utmpx.h>} include file or equivalent, so portable scripts +should not rely on its existence on non-POSIX platforms. + @exitstatus @@ -14908,6 +14922,10 @@ After each login name print a character indicating the user's message status: @end table +The @command{who} command is installed only on platforms with the +POSIX @code{<utmpx.h>} include file or equivalent, so portable scripts +should not rely on its existence on non-POSIX platforms. + @exitstatus @@ -15641,6 +15659,9 @@ arch [@var{option}] The program accepts the @ref{Common options} only. +@command{arch} is not installed by default, so portable scripts should +not rely on its existence. + @exitstatus @@ -15832,6 +15853,10 @@ hostname [@var{name}] The only options are @option{--help} and @option{--version}. @xref{Common options}. +@command{hostname} is not installed by default, and other packages +also supply a @command{hostname} command, so portable scripts should +not rely on its existence or on the exact behavior documented above. + @exitstatus @@ -15857,6 +15882,10 @@ On that system, the 32-bit quantity happens to be closely related to the system's Internet address, but that isn't always the case. +@command{hostid} is installed only on systems that have the +@code{gethostid} function, so portable scripts should not rely on its +existence. + @exitstatus @node uptime invocation @@ -15890,6 +15919,13 @@ also include processes in the uninterruptible sleep state (that is, those processes which are waiting for disk I/O). The Linux kernel includes uninterruptible processes. +@command{uptime} is installed only on platforms with infrastructure +for obtaining the boot time, and other packages also supply an +@command{uptime} command, so portable scripts should not rely on its +existence or on the exact behavior documented above. + +@exitstatus + @node SELinux context @chapter SELinux context @@ -16203,6 +16239,10 @@ files to the required positions under your intended new root directory. Finally, if the executable requires any other files (e.g., data, state, device files), copy them into place, too. +@command{chroot} is installed only on systems that have the +@code{chroot} function, so portable scripts should not rely on its +existence. + @cindex exit status of @command{chroot} Exit status: @@ -16431,6 +16471,10 @@ option syntax @option{-@var{adjustment}}. New scripts should use @end table +@command{nice} is installed only on systems that have the POSIX +@code{setpriority} function, so portable scripts should not rely on +its existence on non-POSIX platforms. + @cindex exit status of @command{nice} Exit status: @@ -16642,6 +16686,11 @@ Specify the size of the buffer to use in fully buffered mode. @end table +@command{stdbuf} is installed only on platforms that use the +Executable and Linkable Format (ELF) and support the +@code{constructor} attribute, so portable scripts should not rely on +its existence. + @cindex exit status of @command{stdbuf} Exit status: |