$()
vs )
| IFS
| using siginfo
| nanosleep
| line charset
| locale
Example session on a 4.3BSD Unix (vax-780)
User input in bold face.
$ vax780 run.conf VAX780 simulator V3.8-1 Listening on port 2311 (socket 6) Modem control activated Boot : ra(0,0)vmunix 279844+80872+100324 start 0x12f8 4.3 BSD UNIX #1: Fri Jun 6 19:55:29 PDT 1986 karels@monet.Berkeley.EDU:/usr/src/sys/GENERIC real mem = 8388608 SYSPTSIZE limits number of buffers to 140 avail mem = 7187456 using 140 buffers containing 524288 bytes of memory mcr0 at tr1 mcr1 at tr2 uba0 at tr3 hk0 at uba0 csr 177440 vec 210, ipl 15 rk0 at hk0 slave 0 rk1 at hk0 slave 1 rk2 at hk0 slave 2 rk3 at hk0 slave 3 uda0 at uba0 csr 172150 vec 774, ipl 15 ra0 at uda0 slave 0 zs0 at uba0 csr 172520 vec 224, ipl 15 ts0 at zs0 slave 0 dz0 at uba0 csr 160100 vec 300, ipl 15 Changing root device to ra0a Automatic reboot in progress... Mon Dec 18 08:37:13 PST 2000 /dev/ra0a: 399 files, 4649 used, 2780 free (4 frags, 347 blocks, 0.1% fragmentation) /dev/rra0h: 15739 files, 94111 used, 44473 free (185 frags, 5536 blocks, 0.1% fragmentation) /dev/rra0g: 2 files, 9 used, 245216 free (16 frags, 30650 blocks, 0.0% fragmentation) Mon Dec 18 08:37:21 PST 2000 checking quotas: done. starting system logger checking for core dump... /a/crash: No such file or directory Dec 18 08:37:22 myname savecore: /a/crash: No such file or directory starting local daemons: namedDec 18 08:37:22 myname named[53]: No root Nameserver sendmail. preserving editor files clearing /tmp standard daemons: update cron accounting. starting network daemons: rwhod inetd printer. Mon Dec 18 08:37:23 PST 2000 4.3 BSD UNIX (myname.my.domain) (console) login: root Last login: Mon Dec 18 08:27:37 on console Dec 18 08:38:07 myname login: ROOT LOGIN console 4.3 BSD UNIX #1: Fri Jun 6 19:55:29 PDT 1986 Would you like to play a game? Don't login as root, use su myname# ps afx PID TT STAT TIME COMMAND 0 ? D 0:00 swapper 1 ? S 0:00 init 2 ? D 0:00 pagedaemon 46 co S 0:00 /etc/syslogd 53 ? I 0:00 /etc/named /etc/named.boot 58 ? I 0:00 /usr/lib/sendmail -bd -q30m 59 ? I 0:00 -running queue (sendmail) 68 ? I 0:00 /etc/update 71 ? S 0:00 /etc/cron 79 ? I 0:00 /etc/rwhod 83 ? I 0:00 /etc/inetd 88 ? I 0:00 /usr/lib/lpd 93 co S 0:00 -csh (csh) 105 co R 0:00 ps afx 94 00 I 0:00 - std.9600 tty00 (getty) 95 01 I 0:00 - std.9600 tty01 (getty) 96 02 I 0:00 - std.9600 tty02 (getty) 97 03 I 0:00 - std.9600 tty03 (getty) 98 04 I 0:00 - std.9600 tty04 (getty) 99 05 I 0:00 - std.9600 tty05 (getty) 100 06 I 0:00 - std.9600 tty06 (getty) 101 07 I 0:00 - std.9600 tty07 (getty) myname# cd /usr/src/sys/GENERIC myname# setenv TERM vt100 myname# vi ../sys/kern_exec.c { insert the ff. in kern_exec.c l.159: printf (" have #! detected\n"); } myname# make cc -c -S -I. -I../h -DGENERIC -DVAX730 -DVAX750 -DVAX780 -DVAX8600 -DTCP_COMPAT_42 -DNS -DINET -DQUOTA -DKERNEL ../sys/kern_exec.c /lib/c2 kern_exec.s | ../vax/inline/inline | as -o kern_exec.o rm -f kern_exec.s loading vmunix rearranging symbols text data bss dec hex 279860 80884 100324 461068 7090c myname# cp vmunix / myname# halt { and reboot } ... # cat > try #!/bin/sh echo x <ctrl-d> # chmod u+x try # ./try have #! detected x #
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