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|00000000| 5c 73 65 63 74 69 6f 6e | 7b 73 79 73 74 65 6d 20 |\section|{system |
|00000010| 2d 2d 2d 20 41 63 63 65 | 73 73 20 6f 70 65 72 61 |--- Acce|ss opera|
|00000020| 74 69 6e 67 20 73 79 73 | 74 65 6d 7d 0d 5c 6c 61 |ting sys|tem}.\la|
|00000030| 62 65 6c 7b 66 6e 3a 73 | 79 73 74 65 6d 7d 0d 5c |bel{fn:s|ystem}.\|
|00000040| 69 6e 64 65 78 7b 73 79 | 73 74 65 6d 28 29 7d 0d |index{sy|stem()}.|
|00000050| 5c 69 6e 64 65 78 7b 61 | 63 63 65 73 73 20 6f 70 |\index{a|ccess op|
|00000060| 65 72 61 74 69 6e 67 20 | 73 79 73 74 65 6d 7d 0d |erating |system}.|
|00000070| 5c 69 6e 64 65 78 7b 73 | 68 65 6c 6c 69 6e 67 20 |\index{s|helling |
|00000080| 6f 75 74 7d 0d 5c 69 6e | 64 65 78 7b 6f 70 65 72 |out}.\in|dex{oper|
|00000090| 61 74 69 6e 67 20 73 79 | 73 74 65 6d 20 61 63 63 |ating sy|stem acc|
|000000a0| 65 73 73 7d 0d 5c 62 65 | 67 69 6e 7b 72 61 69 6c |ess}.\be|gin{rail|
|000000b0| 7d 0d 53 79 73 74 65 6d | 20 3a 20 27 73 79 73 74 |}.System| : 'syst|
|000000c0| 65 6d 27 20 27 28 27 20 | 53 74 72 69 6e 67 20 27 |em' '(' |String '|
|000000d0| 29 27 20 3b 0d 5c 65 6e | 64 7b 72 61 69 6c 7d 0d |)' ;.\en|d{rail}.|
|000000e0| 0d 54 68 65 20 5c 76 65 | 72 62 2b 73 79 73 74 65 |.The \ve|rb+syste|
|000000f0| 6d 2b 20 66 75 6e 63 74 | 69 6f 6e 20 61 6c 6c 6f |m+ funct|ion allo|
|00000100| 77 73 20 5c 52 4c 61 42 | 5c 20 70 72 6f 67 72 61 |ws \RLaB|\ progra|
|00000110| 6d 73 20 74 6f 20 61 63 | 63 65 73 73 20 74 68 65 |ms to ac|cess the|
|00000120| 0d 6f 70 65 72 61 74 69 | 6e 67 20 73 79 73 74 65 |.operati|ng syste|
|00000130| 6d 2e 20 54 68 65 20 73 | 74 72 69 6e 67 20 61 72 |m. The s|tring ar|
|00000140| 67 75 6d 65 6e 74 20 69 | 73 20 70 61 73 73 65 64 |gument i|s passed|
|00000150| 20 64 69 72 65 63 74 6c | 79 20 74 6f 20 74 68 65 | directl|y to the|
|00000160| 0d 64 65 66 61 75 6c 74 | 20 63 6f 6d 6d 61 6e 64 |.default| command|
|00000170| 20 69 6e 74 65 72 70 72 | 65 74 65 72 20 66 6f 72 | interpr|eter for|
|00000180| 20 65 78 65 63 75 74 69 | 6f 6e 20 2d 20 6e 6f 72 | executi|on - nor|
|00000190| 6d 61 6c 6c 79 20 74 68 | 65 20 42 6f 75 72 6e 65 |mally th|e Bourne|
|000001a0| 20 73 68 65 6c 6c 0d 6f | 72 20 73 6f 6d 65 20 76 | shell.o|r some v|
|000001b0| 61 72 69 61 74 69 6f 6e | 2e 20 5c 52 4c 61 42 5c |ariation|. \RLaB\|
|000001c0| 20 77 61 69 74 73 20 75 | 6e 74 69 6c 20 74 68 65 | waits u|ntil the|
|000001d0| 20 73 79 73 74 65 6d 20 | 63 61 6c 6c 20 69 73 20 | system |call is |
|000001e0| 66 69 6e 69 73 68 65 64 | 2c 20 61 6e 64 0d 74 68 |finished|, and.th|
|000001f0| 65 6e 20 72 65 74 75 72 | 6e 73 20 79 6f 75 20 74 |en retur|ns you t|
|00000200| 6f 20 74 68 65 20 70 72 | 6f 6d 70 74 2e 20 20 0d |o the pr|ompt.  .|
|00000210| 0d 54 68 65 20 72 65 74 | 75 72 6e 20 76 61 6c 75 |.The ret|urn valu|
|00000220| 65 20 66 6f 72 20 74 68 | 69 73 20 66 75 6e 63 74 |e for th|is funct|
|00000230| 69 6f 6e 20 69 73 20 68 | 65 61 76 69 6c 79 20 73 |ion is h|eavily s|
|00000240| 79 73 74 65 6d 20 73 70 | 65 63 69 66 69 63 2e 20 |ystem sp|ecific. |
|00000250| 20 50 6f 72 74 61 62 6c | 65 0d 73 63 72 69 70 74 | Portabl|e.script|
|00000260| 73 20 73 68 6f 75 6c 64 | 20 6e 6f 74 20 75 73 65 |s should| not use|
|00000270| 20 74 68 65 20 72 65 74 | 75 72 6e 20 76 61 6c 75 | the ret|urn valu|
|00000280| 65 20 66 72 6f 6d 20 5c | 76 65 72 62 2b 73 79 73 |e from \|verb+sys|
|00000290| 74 65 6d 2b 2e 0d 0d 5c | 70 61 72 61 67 72 61 70 |tem+...\|paragrap|
|000002a0| 68 7b 45 78 61 6d 70 6c | 65 7d 0d 5c 69 6e 64 65 |h{Exampl|e}.\inde|
|000002b0| 78 7b 65 78 61 6d 70 6c | 65 20 6f 66 20 73 79 73 |x{exampl|e of sys|
|000002c0| 74 65 6d 28 29 7d 0d 5c | 69 6e 64 65 78 7b 73 79 |tem()}.\|index{sy|
|000002d0| 73 74 65 6d 28 29 21 65 | 78 61 6d 70 6c 65 7d 0d |stem()!e|xample}.|
|000002e0| 5c 62 65 67 69 6e 7b 76 | 65 72 62 61 74 69 6d 7d |\begin{v|erbatim}|
|000002f0| 0d 3e 20 73 79 73 74 65 | 6d 28 22 64 66 22 29 0d |.> syste|m("df").|
|00000300| 46 69 6c 65 73 79 73 74 | 65 6d 20 20 20 20 20 20 |Filesyst|em      |
|00000310| 20 20 20 31 30 32 34 2d | 62 6c 6f 63 6b 73 20 20 |   1024-|blocks  |
|00000320| 55 73 65 64 20 41 76 61 | 69 6c 61 62 6c 65 20 43 |Used Ava|ilable C|
|00000330| 61 70 61 63 69 74 79 20 | 4d 6f 75 6e 74 65 64 20 |apacity |Mounted |
|00000340| 6f 6e 0d 2f 64 65 76 2f | 68 64 62 35 20 20 20 20 |on./dev/|hdb5    |
|00000350| 20 20 20 20 20 20 20 20 | 20 32 35 30 35 35 39 20 |        | 250559 |
|00000360| 20 31 37 38 30 37 39 20 | 20 20 20 35 39 39 35 33 | 178079 |   59953|
|00000370| 20 20 20 20 20 37 35 25 | 20 20 20 2f 0d 2f 64 65 |     75%|   /./de|
|00000380| 76 2f 68 64 61 31 20 20 | 20 20 20 20 20 20 20 20 |v/hda1  |        |
|00000390| 20 20 20 32 30 37 32 34 | 30 20 20 31 39 34 35 38 |   20724|0  19458|
|000003a0| 30 20 20 20 20 31 32 36 | 36 30 20 20 20 20 20 39 |0    126|60     9|
|000003b0| 34 25 20 20 20 2f 64 6f | 73 43 0d 20 20 20 20 20 |4%   /do|sC.     |
|000003c0| 20 20 20 30 0d 3e 20 73 | 79 73 74 65 6d 28 22 64 |   0.> s|ystem("d|
|000003d0| 75 20 2d 73 22 29 3b 0d | 32 39 35 33 20 20 20 20 |u -s");.|2953    |
|000003e0| 2e 0d 3e 20 73 79 73 74 | 65 6d 28 22 62 61 73 68 |..> syst|em("bash|
|000003f0| 22 29 3b 0d 62 61 73 68 | 24 20 65 63 68 6f 20 22 |");.bash|$ echo "|
|00000400| 4e 6f 77 20 77 65 20 68 | 61 76 65 20 61 20 73 68 |Now we h|ave a sh|
|00000410| 65 6c 6c 20 72 75 6e 6e | 69 6e 67 20 69 6e 73 69 |ell runn|ing insi|
|00000420| 64 65 20 52 4c 61 42 22 | 0d 4e 6f 77 20 77 65 20 |de RLaB"|.Now we |
|00000430| 68 61 76 65 20 61 20 73 | 68 65 6c 6c 20 72 75 6e |have a s|hell run|
|00000440| 6e 69 6e 67 20 69 6e 73 | 69 64 65 20 52 4c 61 42 |ning ins|ide RLaB|
|00000450| 0d 62 61 73 68 24 20 77 | 0d 20 20 35 3a 33 32 61 |.bash$ w|.  5:32a|
|00000460| 6d 20 20 75 70 20 20 38 | 3a 30 39 2c 20 20 32 20 |m  up  8|:09,  2 |
|00000470| 75 73 65 72 73 2c 20 20 | 6c 6f 61 64 20 61 76 65 |users,  |load ave|
|00000480| 72 61 67 65 3a 20 30 2e | 30 33 2c 20 30 2e 31 31 |rage: 0.|03, 0.11|
|00000490| 2c 20 30 2e 30 39 0d 55 | 73 65 72 20 20 20 20 20 |, 0.09.U|ser     |
|000004a0| 74 74 79 20 20 20 20 20 | 20 66 72 6f 6d 20 20 20 |tty     | from   |
|000004b0| 20 20 20 20 20 20 20 20 | 20 20 6c 6f 67 69 6e 40 |        |  login@|
|000004c0| 20 20 69 64 6c 65 20 20 | 20 4a 43 50 55 20 20 20 |  idle  | JCPU   |
|000004d0| 50 43 50 55 20 20 77 68 | 61 74 0d 62 72 61 64 68 |PCPU  wh|at.bradh|
|000004e0| 20 20 20 20 74 74 79 31 | 20 20 20 20 20 20 20 20 |    tty1|        |
|000004f0| 20 20 20 20 20 20 20 20 | 20 20 20 20 20 20 39 3a |        |      9:|
|00000500| 32 34 70 6d 20 20 38 3a | 30 38 20 20 20 31 3a 30 |24pm  8:|08   1:0|
|00000510| 35 20 20 20 20 20 20 20 | 20 20 28 73 74 61 72 74 |5       |  (start|
|00000520| 78 29 0d 62 72 61 64 68 | 20 20 20 20 74 74 79 70 |x).bradh|    ttyp|
|00000530| 31 20 20 20 20 20 20 20 | 20 20 20 20 20 20 20 20 |1       |        |
|00000540| 20 20 20 20 20 20 39 3a | 35 33 70 6d 20 20 20 20 |      9:|53pm    |
|00000550| 20 20 20 20 20 20 20 32 | 32 20 20 20 20 20 20 20 |       2|2       |
|00000560| 20 20 77 0d 62 61 73 68 | 24 20 65 78 69 74 0d 65 |  w.bash|$ exit.e|
|00000570| 78 69 74 0d 3e 20 73 79 | 73 74 65 6d 28 22 6c 73 |xit.> sy|stem("ls|
|00000580| 20 2d 6c 20 4d 61 6b 65 | 66 69 6c 65 22 29 3b 0d | -l Make|file");.|
|00000590| 2d 72 77 2d 72 2d 2d 72 | 2d 2d 20 20 20 31 20 62 |-rw-r--r|--   1 b|
|000005a0| 72 61 64 68 20 20 20 20 | 62 69 6e 20 20 20 20 20 |radh    |bin     |
|000005b0| 20 20 20 20 20 33 35 33 | 37 20 4d 61 72 20 20 36 |     353|7 Mar  6|
|000005c0| 20 30 30 3a 33 33 20 4d | 61 6b 65 66 69 6c 65 0d | 00:33 M|akefile.|
|000005d0| 5c 65 6e 64 7b 76 65 72 | 62 61 74 69 6d 7d 0d 0d |\end{ver|batim}..|
|000005e0| 53 65 65 20 61 6c 73 6f | 3a 20 50 61 67 65 7e 5c |See also|: Page~\|
|000005f0| 70 61 67 65 72 65 66 7b | 66 6e 3a 63 64 7d 20 5c |pageref{|fn:cd} \|
|00000600| 76 65 72 62 2b 63 64 28 | 29 2b 2c 0d 50 61 67 65 |verb+cd(|)+,.Page|
|00000610| 7e 5c 70 61 67 65 72 65 | 66 7b 66 6e 3a 67 65 74 |~\pagere|f{fn:get|
|00000620| 6c 69 6e 65 7d 20 5c 76 | 65 72 62 2b 67 65 74 6c |line} \v|erb+getl|
|00000630| 69 6e 65 28 29 2b 2e 0d | 0d 5c 6e 65 77 70 61 67 |ine()+..|.\newpag|
|00000640| 65 0d 0d 0d             |                         |e...    |        |
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