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Top Forums Shell Programming and Scripting Bad substitution - ShellCheck says okay Post 303029944 by wisecracker on Sunday 3rd of February 2019 10:06:45 AM
Old 02-03-2019
Hi Xubuntu56...



Quote:
ShellCheck doesn't find any issues with this script.
REMEMBER!
ShellCheck ONLY checks validity and syntax of the shell in use, and NOT ALL shells.
For that is is simply superb. However don't expect it to check validity and syntax of transient commands.

A deliberate simple example from ShellCheck.


As you can see, 'sed' and 'sleep' will create an error and has absolutely no idea what 'junk_command' is.
Hope this helps.
Bad substitution - ShellCheck says okay-shellcheckpng
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acl_check(3SEC) 				       File Access Control Library Functions					   acl_check(3SEC)

NAME
acl_check - check the validity of an ACL SYNOPSIS
cc [ flag... ] file... -lsec [ library... ] #include <sys/acl.h> int acl_check(acl_t *aclp, int isdir); DESCRIPTION
The acl_check() function checks the validity of an ACL pointed to by aclp. The isdir argument checks the validity of an ACL that will be applied to a directory. The ACL can be either a POSIX draft ACL as supported by UFS or NFSv4 ACL as supported by ZFS or NFSV4. When the function verifies a POSIX draft ACL, the rules followed are described in aclcheck(3SEC). For NFSv4 ACL, the ACL is verified against the following rules: o The inheritance flags are valid. o The ACL must have at least one ACL entry and no more than {MAX_ACL_ENTRIES}. o The permission field contains only supported permissions. o The entry type is valid. o The flag fields contain only valid flags as supported by NFSv4/ZFS. If any of the above rules are violated, the function fails with errno set to EINVAL. RETURN VALUES
If the ACL is valid, acl_check() returns 0. Otherwise errno is set to EINVAL and the return value is set to one of the following: EACL_INHERIT_ERROR There are invalid inheritance flags specified. EACL_FLAGS_ERROR There are invalid flags specified on the ACL that don't map to supported flags in NFSV4/ZFS ACL model. EACL_ENTRY_ERROR The ACL contains an unknown value in the type field. EACL_MEM_ERROR The system cannot allocate any memory. EACL_INHERIT_NOTDIR Inheritance flags are only allowed for ACLs on directories. ATTRIBUTES
See attributes(5) for descriptions of the following attributes: +-----------------------------+-----------------------------+ | ATTRIBUTE TYPE | ATTRIBUTE VALUE | +-----------------------------+-----------------------------+ |Interface Stability |Committed | +-----------------------------+-----------------------------+ |MT-Level |MT-Safe | +-----------------------------+-----------------------------+ SEE ALSO
acl(2), aclcheck(3SEC), aclsort(3SEC), acl(5), attributes(5) SunOS 5.11 22 Apr 2008 acl_check(3SEC)
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