介绍三个shell脚本

KornLee

完成相同的作业,看看他们之间的区别.

1. #!/bin/csh -f
2. # The Party Program--Invitations to friends from the "guest" file
3. #set guestfile = ~/shell/guests
4. set guestfile = ./guests
5. if ( ! -e "$guestfile" ) then
6.    echo "$guestfile:t non-existent"
7.    exit 1
8. endif
9. setenv PLACE "Sarotini's"
10. @ Time = `date +%H` + 1
11. set food = ( cheese crackers shrimp drinks "hot dogs" sandwiches )
12. foreach person ( `cat $guestfile` )
13.     if ( $person =~ root ) continue
14.     mail -v -s "Party" $person << FINIS   # Start of here document
15.     Hi ${person}! Please join me at $PLACE for a party!
16.     Meet me at $Time o'clock.
17.     I'll bring the ice cream. Would you please bring $food[1] and
18.     anything else you would like to eat? Let me know if you can't
19.     make it. Hope to see you soon.
20.           Your pal,
21.                 ellie@`hostname` # or `uname -n`
22. FINIS
23.    shift food
24.    if ( $#food ==  0 ) then
25.       set food = ( cheese crackers shrimp drinks "hot dogs"
26.       sandwiches )
27.    endif
28. end
31. #!/bin/sh
32. # The Party Program--Invitations to friends from the "guest" file
33. #guestfile=/home/jody/ellie/shell/guests
34. guestfile=./guests
36. if [ ! -f "$guestfile" ]
37. then
38.    echo "`basename $guestfile` non-existent"
39.    exit 1
40. fi
41. PLACE="Sarotini's"
42. export PLACE
43. Time=`date +%H`
44. Time=`expr $Time + 1`
45. set cheese crackers shrimp drinks "hot dogs" sandwiches
47. for person in `cat $guestfile`
48. do
49.    if [ $person = root ]
50.    then
51.       continue
52.    else
53.       mail -v -s "Party" $person <<- FINIS
54.       Hi ${person}! Please join me at $PLACE for a party!
55.       Meet me at $Time o'clock.
56.       I'll bring the ice cream. Would you please bring $1 and
57.       anything else you would like to eat? Let me know if you
59.       can't make it.
60.       Hope to see you soon.
61.       Your pal,
62.       ellie@`hostname`
63. FINIS
64.       shift
65.       if [ $# -eq 0 ]
66.       then
67.          set cheese crackers shrimp drinks "hot dogs" sandwiches
68.       fi
69.    fi
70. done
71. echo "Bye..."
75. #!/bin/ksh
76. # The Party Program--Invitations to friends from the
77. # "guest" file
79. #guestfile=~/shell/guests
80. guestfile=./guests
81. if [[ ! -a "$guestfile" ]]
82. then
83.    print "${guestfile##*/} non-existent"
84.    exit 1
85. fi
87. export PLACE="Sarotini's"
88. (( Time=$(date +%H) + 1))
89. set cheese crackers shrimp drinks "hot dogs" sandwiches
90. for person in $(< $guestfile)
91. do
92.    if  [[ $person = root ]]
93.    then
94.       continue
95.    else
96.       mail -v -s "Party" $person <<- FINIS # Start of here document
97.       Hi ${person}! Please join me at $PLACE for a party!
98.       Meet me at $Time o'clock.
99.       I'll bring the ice cream. Would you please bring $1
100.       and anything else you would like to eat? Let me know
101.       if you can't make it.
103.       Hope to see you soon.
104.             Your pal,
105.             ellie@`hostname`
106. FINIS
107.       shift
108.       if (( $# ==  0 ))
109.       then
110.          set cheese crackers shrimp drinks "hot dogs" sandwiches
111.       fi
112.    fi
113. done
114. print "Bye..."

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plan9

还是Bash和Ksh比较简洁，Csh看起来不习惯。呵呵。

flaboy

第一次遇到fi的时候
我猜了好半天...

kentan

我也看到了这个例子,我运行了第二个程序,提示说不存在guests文件,究竟guests应该是什么格式的文件?