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Shell trong Linux.

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Shell trong Linux.

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Shell trong Linux.

SHELL---_LINUX  !"#$%&'(")*+&,-.%/&,-011/&2+&34&'& !/&/&5/&3"4-6788&!"9:55! 788-;&<)--!= 8>--!=7%? ' 8>7%?<@A-B#C&DE%!"! "F8"%788 #"$ $>GH)7-!!87I@AJK"%L"$;)M@A$N#O+! $M@PQ!RPQ!$34&'&/$S'PT6G(")@P*$788HI F/U@D"N#O+V"WHXIH I LB@A#U;!""N#''P$H2I 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F'#|788 !"& |7"&H38.3I2 " L88)566+JKL; . ( (J9M-F!)9M-FNOP;+22Q-+4 R S=!Z[\3 #"1. KD^20[l0`[h0] --!ĩĩ--! ẵẵ sĐrẳrrqr átrẵẵ srÔrrvárãqrtrrrạtằ ^20[l0`[h0 --!--! ẵẵ srĐrqrẳrqrơqrãqrtrtrẵẵ srÔrrrơrrạắằ ^h08[e0n/012 340`l0[ld0 --!ĩĩ--! --!2ẻátrẵẵ srÔr rđ Ărqrẳrqrẵẵ sĐƠr átrơđ Ărqrẳrqrẵẵ sƯ SHELL_LINUX 10-18 10 [...]... standard output đên standard error ́ ̣ ́ Cú phap : ́ from>&destination 3 Ham ̀ Cú phap : ́ function-name ( ) { command1 commandN return } hoăc ̣ function function-name SHELL_ LINUX 11-18 11 SHELL -_LINUX { } command1 commandN return Trong đo, function-name là tên ham, lênh return sẽ kêt thuc ham ́ ̀ ̣ ́ ́ ̀     Goi ham : function-name ̣ ̀ Truyên tham số : function-name $arg1 $arg2 ̀ Lây tham... ̉ ́ ̀ ̀ ́ ̀ ̣ Ví dụ : shift 2 6 Phat sinh số ngâu nhiên ́ ̃ $RANDOM là 1 biên ham cua Bash (không phai là hăng sô) cho phep phat sinh số ngâu nhiên ́ ̀ ̉ ̉ ̀ ́ ́ ́ ̃ trong pham vi 0 – 32767 ̣ ví dụ : SHELL_ LINUX 12-18 12 SHELL -_LINUX #!/bin/bash MAXCOUNT=10 count=1 echo echo "$MAXCOUNT random numbers:" echo " -" while [ "$count" -le $MAXCOUNT ] # Generate 10 ($MAXCOUNT) random integers... thế tât cả chuôi trung vơi substring băng replacement ́ ̃ ̀ ́ ̀ Ví dụ : stringZ=abcABC123ABCabc echo ${stringZ/abc/xyz} echo ${stringZ//abc/xyz} SHELL_ LINUX # xyzABC123ABCabc # xyzABC123ABCxyz 15-18 15 SHELL -_LINUX Bai tập ̀ Bai 1 : Viêt chương trinh shell giai phương trinh bâc hai : ax2 + bx +c =0 vơi cac tham số a,b,c nhâp từ ̀ ́ ̀ ̉ ̀ ̣ ́ ́ ̣ ban phim và cac kêt quả chinh xac đên hai chữ... _filesize[$index]=$filesize let "index +=1" fi SHELL_ LINUX # trương thứ 5 cua kêt quả lênh ls –l là kich ̀ ̉ ́ ̣ ́ # thươc file ́ # gan mang file name ́ ̉ # gan mang file size ́ ̉ 16-18 16 SHELL -_LINUX done echo "Tong so tap tin : $index" for ((i=0 ; i myf this is my file nhân Ctrl+D ́  cat sẽ tao file myf chưa dong “this is my file” ̣ ́ ̀ Trong lâp trinh Linux, cac thiêt bị như ban... 2 nghiem" x1=$(echo "scale=2; -($b + sqrt($delta))/(2*$a)" | bc) echo "x1= $x1" x2=$(echo "scale=2; -($b - sqrt($delta))/(2*$a)" | bc) echo "x2= $x2" fi exit 0 Bai 2 : ̀ Viêt chương trinh shell liêt kê cac tâp tin trong thư muc nhâp vao từ ban phim mà có kich thươc > 4KB ́ ̀ ̣ ́ ̣ ̣ ̣ ̀ ̀ ́ ́ ́ theo dang sau : ̣ Tông số tâp tin ̉ ̣ Tâp tin 1 ̣ kich thươc ́ ́ tâp in n ̣ kich thươc ́ ́ #!/bin/bash... array2=( [0]="first element" [1]="second element" [3]="fourth element" ) echo echo echo echo ${array2[0]} ${array2[1]} ${array2[2]} ${array2[3]} SHELL_ LINUX # # # # first element second element không khơi tao nên có giá trị null ̉ ̣ fourth element 13-18 13 SHELL -_LINUX Ví dụ : arrayZ=( one two three four five five ) echo ${arrayZ[@]:0} # one two three four five five : tât cả cac phân tử ́ ́ ̀... đây cung dung để minh hoa lênh “shift “ Ban có thể gõ tham số cua chương ̣ ́ ̃ ̀ ̣ ̣ ̣ ̉ trinh theo 2 cach : ̀ ́ /convert –b radix –n number hoăc /conver –n number –b radix ̣ #!/bin/bash SHELL_ LINUX 17-18 17 SHELL -_LINUX if [ $# -ne 4 ]; then echo "Usage : $0 -b radix -n number or $0 -n number -b radix" exit 1 fi while [ "$1" ] do if [ "$1" = "-b" ];then ob="$2" case $ob in 16 ) basesystem="Hex";;... "obase=$ob;ibase=10;$num;" | bc) echo "$num Decimal number = $op in $basesystem number system (base=$ob)" exit 0 Ở đoan code trên thì quan trong nhât là dong “op=$(echo "obase=$ob;ibase=10;$num;" | bc)” Lênh nay ̣ ̣ ́ ̀ ̣ ̀ dung để chuyên cơ sô ̀ ̉ ́ End SHELL_ LINUX 18-18 18 . ()a@Pbc_'P$=34&'&7d&ed"f_$=e3'&g#B#O+%"Gbg7&h&"Y#O+7!""i"fi!!87H$"BIi!#&!7i#B%"Gbi%"Gbi*@D"bi!ii"i7j7k-6!!i!iiGi ]SHELL_ LINUX 1-18 1 SHELL- -- _LINUX*  +,-./012 34056̉ ̣ 34&'&7%&&&h&'&. ()NOP-QRS&,TUVa@8)Y8>"•&‡;&-;8";$ SHELL_ LINUX 2-18 2 SHELL- -- _LINUX3 4&'&7!!! !2=![7!#B!-G'P<@A!$,•EˆK‰7!!S],•EˆK‰]M"i&h&%"Gb@•&$&Y8>"7![$"7!j<#BOQ!@97!!

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Xem thêm: Shell trong Linux., Shell trong Linux., Sử dụng biến Lệnh echo Tính tốn trong Shell Sư du ng ex Một vài thơng tin về dấu ngoặc kép, Tham số lệnh Pipe Lê nh test hay câu truc [ biêu thưc ] ̣, Multilevel if-then-else Vòng lặp trong shell script: Vòng lặp for Vòng lặp while Cấu trúc case Làm sao để debug script ?, Bash script nâng cao IO Redirection and file descriptors, Ham ̀ Mang : ̉ 1 : Getting started with Shell Programming 1. Viết shell script như thế nào ?

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