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Full Discussion: Convert a bash to ash
Operating Systems Linux Ubuntu Convert a bash to ash Post 302936520 by Scrutinizer on Thursday 26th of February 2015 06:11:09 AM
Old 02-26-2015
That looks a bit garbled, this should be:
Code:
[ ! -z "$PS1" ]

Note the spaces around the brackets...

which is equivalent to
Code:
[ -n "$PS1" ]

or
Code:
[ "$PS1" ]

But the logical counterpart of [ ! -t 0 ] would be [ -z "$PS1" ]

However,
Code:
[ ! -t 0 ]

is part of Posix so this should just work in ash. So I do not think this is a bash vs. ash matter.
If it does not work in a certain application, then it should also not work in the case of bash, unless your ash version has a bug...

Last edited by Scrutinizer; 02-26-2015 at 09:39 AM..
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httpd_webalizer_script_selinux(8)		       SELinux Policy httpd_webalizer_script			 httpd_webalizer_script_selinux(8)

NAME
httpd_webalizer_script_selinux - Security Enhanced Linux Policy for the httpd_webalizer_script processes DESCRIPTION
Security-Enhanced Linux secures the httpd_webalizer_script processes via flexible mandatory access control. The httpd_webalizer_script processes execute with the httpd_webalizer_script_t SELinux type. You can check if you have these processes run- ning by executing the ps command with the -Z qualifier. For example: ps -eZ | grep httpd_webalizer_script_t ENTRYPOINTS
The httpd_webalizer_script_t SELinux type can be entered via the shell_exec_t, httpd_webalizer_script_exec_t, httpd_webalizer_script_exec_t file types. The default entrypoint paths for the httpd_webalizer_script_t domain are the following: /bin/d?ash, /bin/zsh.*, /bin/ksh.*, /usr/bin/d?ash, /usr/bin/zsh.*, /usr/bin/ksh.*, /bin/esh, /bin/mksh, /bin/sash, /bin/tcsh, /bin/yash, /bin/bash, /bin/fish, /bin/bash2, /usr/bin/esh, /usr/bin/sash, /usr/bin/tcsh, /usr/bin/yash, /usr/bin/fish, /usr/bin/mksh, /usr/bin/bash, /sbin/nologin, /usr/sbin/sesh, /usr/bin/bash2, /usr/sbin/smrsh, /usr/bin/scponly, /usr/sbin/nologin, /usr/libexec/sesh, /usr/sbin/scponlyc, /usr/bin/git-shell, /usr/libexec/git-core/git-shell PROCESS TYPES
SELinux defines process types (domains) for each process running on the system You can see the context of a process using the -Z option to ps Policy governs the access confined processes have to files. SELinux httpd_webalizer_script policy is very flexible allowing users to setup their httpd_webalizer_script processes in as secure a method as possible. The following process types are defined for httpd_webalizer_script: httpd_webalizer_script_t Note: semanage permissive -a httpd_webalizer_script_t can be used to make the process type httpd_webalizer_script_t permissive. SELinux does not deny access to permissive process types, but the AVC (SELinux denials) messages are still generated. BOOLEANS
SELinux policy is customizable based on least access required. httpd_webalizer_script policy is extremely flexible and has several bool- eans that allow you to manipulate the policy and run httpd_webalizer_script with the tightest access possible. If you want to deny any process from ptracing or debugging any other processes, you must turn on the deny_ptrace boolean. Enabled by default. setsebool -P deny_ptrace 1 If you want to allow all domains to use other domains file descriptors, you must turn on the domain_fd_use boolean. Enabled by default. setsebool -P domain_fd_use 1 If you want to allow all domains to have the kernel load modules, you must turn on the domain_kernel_load_modules boolean. Disabled by default. setsebool -P domain_kernel_load_modules 1 If you want to allow all domains to execute in fips_mode, you must turn on the fips_mode boolean. Enabled by default. setsebool -P fips_mode 1 If you want to enable reading of urandom for all domains, you must turn on the global_ssp boolean. Disabled by default. setsebool -P global_ssp 1 If you want to allow httpd cgi support, you must turn on the httpd_enable_cgi boolean. Disabled by default. setsebool -P httpd_enable_cgi 1 If you want to allow system to run with NIS, you must turn on the nis_enabled boolean. Disabled by default. setsebool -P nis_enabled 1 MANAGED FILES
The SELinux process type httpd_webalizer_script_t can manage files labeled with the following file types. The paths listed are the default paths for these file types. Note the processes UID still need to have DAC permissions. httpd_webalizer_rw_content_t COMMANDS
semanage fcontext can also be used to manipulate default file context mappings. semanage permissive can also be used to manipulate whether or not a process type is permissive. semanage module can also be used to enable/disable/install/remove policy modules. semanage boolean can also be used to manipulate the booleans system-config-selinux is a GUI tool available to customize SELinux policy settings. AUTHOR
This manual page was auto-generated using sepolicy manpage . SEE ALSO
selinux(8), httpd_webalizer_script(8), semanage(8), restorecon(8), chcon(1), sepolicy(8) , setsebool(8) httpd_webalizer_script 14-06-10 httpd_webalizer_script_selinux(8)
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