Date: Fri, 28 Oct 2016 16:36:54 +0100 From: Matthew Seaman <matthew@FreeBSD.org> To: freebsd-questions@freebsd.org Subject: Re: Interesting $0 Problem Message-ID: <d66271c8-b7dd-9262-1c9a-7d8f5c58db79@FreeBSD.org> In-Reply-To: <5a4f0424-cdfa-bd44-9de2-b4860d121584@tundraware.com> References: <b859f7a3-51d1-06f4-e793-332edd212068@tundraware.com> <516bc76f-f14c-e9a5-a246-2e915a5369ce@qeng-ho.org> <5a4f0424-cdfa-bd44-9de2-b4860d121584@tundraware.com>
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This is an OpenPGP/MIME signed message (RFC 4880 and 3156) --ReLnXHWTLma1RUjELW3cqIecNHdKw8OR3 Content-Type: multipart/mixed; boundary="xWQt2FIbEuhNPKDOCLEMup8mntPMKR2FX"; protected-headers="v1" From: Matthew Seaman <matthew@FreeBSD.org> To: freebsd-questions@freebsd.org Message-ID: <d66271c8-b7dd-9262-1c9a-7d8f5c58db79@FreeBSD.org> Subject: Re: Interesting $0 Problem References: <b859f7a3-51d1-06f4-e793-332edd212068@tundraware.com> <516bc76f-f14c-e9a5-a246-2e915a5369ce@qeng-ho.org> <5a4f0424-cdfa-bd44-9de2-b4860d121584@tundraware.com> In-Reply-To: <5a4f0424-cdfa-bd44-9de2-b4860d121584@tundraware.com> --xWQt2FIbEuhNPKDOCLEMup8mntPMKR2FX Content-Type: text/plain; charset=windows-1252 Content-Transfer-Encoding: quoted-printable On 2016/10/28 15:40, Tim Daneliuk wrote: > When is it useful for a script to know it's running in a login context = vs. > a child of the login shell? For scripts in general, there probably isn't much utility in distinguishing a login shell from any other shell. What this does do is signal to the shell itself that it needs to run ~/.login or ~/.bash_login or ~/.logout or whatever other (shell specific) initialization or shutdown code is wanted. > Is there another way to determine if your current shell is the login sh= ell? I can't think of one off hand. I thought you might be able to tell if the shell was a process group leader, but it turns out that any interactive shell makes itself into a group leader: lucid-nonsense:~:% ps -o pid,pgid,command PID PGID COMMAND 88932 88932 -tcsh (tcsh) 89001 89001 ps -o pid,pgid,command lucid-nonsense:~:% tcsh lucid-nonsense:~:% ps -o pid,pgid,command PID PGID COMMAND 88932 88932 -tcsh (tcsh) 89003 89003 tcsh 89007 89007 ps -o pid,pgid,command (The test for being a group leader is where PID =3D=3D PGID) Cheers, Matthew --xWQt2FIbEuhNPKDOCLEMup8mntPMKR2FX-- --ReLnXHWTLma1RUjELW3cqIecNHdKw8OR3 Content-Type: application/pgp-signature; name="signature.asc" Content-Description: OpenPGP digital signature Content-Disposition: attachment; filename="signature.asc" -----BEGIN PGP SIGNATURE----- Comment: GPGTools - https://gpgtools.org iQJ8BAEBCgBmBQJYE3CfXxSAAAAAAC4AKGlzc3Vlci1mcHJAbm90YXRpb25zLm9w ZW5wZ3AuZmlmdGhob3JzZW1hbi5uZXQxOUYxNTRFQ0JGMTEyRTUwNTQ0RTNGMzAw MDUxM0YxMEUwQTlFNEU3AAoJEABRPxDgqeTnmHUP/0yBL0sA2yH95a92rfhL0F63 MHW7hYX96nRdQwaaQpLcShdq5NoHaCpO5l+bPGmdMI8/m/1lRlN1huMvPbR6XR/g wdGykWJoJgomYAvmRUqjG85ti301L9Mm6ygdKtdEIFwD2/7fCdRKRJ4yCR2F8eht DvmFaxIbY6muHhj2q2fN2YfnPLnQiITKxTpSFiqUd1BCH382H3cf8WnUlAoDElxN pWk9VXYYRx1bR5K0tVoNFrBf+fLBawK2ATTQvQJ6dBZRbfUKysmbutUQfc4PSQbL eU2guY2JUY2MJnSgxkkZEilgAT2hHDacHFYJvT97b/u3CghYoV5lHRMWShTLT2Di xbrfPHlwSFSR51I9xlTtoX3ifDUUyaHPgQaPhNTlDuU1blKC99suXCeZpbLwzQRt e0KBzaoyuIaStM4fesvHXiuFT/Ewds+B7515f3ND0VurkbBRfFTI7hj5raSPvPEV 3QG0XzWN1BTBztr21ciT/Eth0B83XMeS30LQZMgZXPsRqAUvRg3SBRRVqe9S4+NN HjxXFh24xw4SRJpwL1cCebcHP6tjM8l9MZtOIwH936eCzPlzOjxfRcQy8+Lbk6wm NPOM/g4EqNPumG/l/b/DeqpcVvUbuAN65+kbmp2g1Mw843wl+yuGYPLZ+xrAR2oJ kPC/NH7uGckiKWZAIg+T =LdzX -----END PGP SIGNATURE----- --ReLnXHWTLma1RUjELW3cqIecNHdKw8OR3--
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