看看我的第一个小script为什么不工作 - 未名空间MITBBS历史存档

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看看我的第一个小script为什么不工作

看看我的第一个小script为什么不工作# Unix - 噫吁兮，危乎高哉

t*l2002-09-08 07:09

1 楼

要实现下列功能:进入目录bbs,显示所有subdir,从屏幕输入要考古的subdir,
进入该目录,浏览最后一片文章.大致是这样的.
cd bbs
ls
read -p " " answer if ( -e $argv[1]) then
cd $argv[1]
pico lastpost
else
echo2 file $argv[1] doesn't exist
endif
学这个都两星期了,还是创不出来可以执行的小程序来.
请大虾指导指导.

r*s2002-09-08 07:09

2 楼

your "if...else" grammar seems to be C shell, unfortunately
"read" only works for bourne shell.

【在 t*******l 的大作中提到】

: 要实现下列功能:进入目录bbs,显示所有subdir,从屏幕输入要考古的subdir,
: 进入该目录,浏览最后一片文章.大致是这样的.
: cd bbs
: ls
: read -p " " answer : if ( -e $argv[1]) then
: cd $argv[1]
: pico lastpost
: else
: echo2 file $argv[1] doesn't exist

t*l2002-09-08 07:09

3 楼

ah?
I use C shell. then what should I do for the same purpose?

【在 r********s 的大作中提到】

: your "if...else" grammar seems to be C shell, unfortunately
: "read" only works for bourne shell.

C*y2002-09-08 07:09

4 楼

I think you need to read some csh intro on the internet.
I always forgot those stupid shell grammars, and can program a pretty good
one via the help of google in a short time.

【在 t*******l 的大作中提到】

: ah?
: I use C shell. then what should I do for the same purpose?

r*s2002-09-08 07:09

5 楼

[10:45pm] cat hoho.sh
#!/bin/sh
cd bbs
ls
echo -n "Which directory you wanna browse:\t "
read answer
if [ -d $answer ]
then
cd $answer
echo "The content of lastpost is:\n"
echo "******"
cat "/home/rhino/bbs/$answer/lastpost"
echo "******"
else
echo "$answer directory does not exitst!"
fi
[10:45pm] ls -R bbs
family love sysop
bbs/family:
lastpost
bbs/love:
lastpost
bbs/sysop:
lastpost
[10:46pm] ./hoho.sh
family love s

【在 t*******l 的大作中提到】

: ah?
: I use C shell. then what should I do for the same purpose?

t*l2002-09-08 07:09

6 楼

thanks rhinoceros!
我又扩展了一下。如果/bbs/boards/family/里有吃，穿，住，用，行中的
若干项，是不是意味着要多几个if语句，以相同的格式？
我刚刚这样试了一下，不行:(
#!/bin/sh
cd bbs
ls
echo -n "Which directory you wanna browse:\t "
read answer
if [ -d $answer ]
then
cd $answer
echo "The content of lastpost is:\n"
echo "******"
cat "/home/rhino/bbs/$answer/lastpost"
echo "******"
else
if [ -d $answer2 ]
then
cd $answer2
ls
if [ -d $answer3 ]
then
cd $answer3
ls

【在 r********s 的大作中提到】

: [10:45pm] cat hoho.sh
: #!/bin/sh
: cd bbs
: ls
: echo -n "Which directory you wanna browse:\t "
: read answer
: if [ -d $answer ]
: then
: cd $answer
: echo "The content of lastpost is:\n"

r*s2002-09-08 07:09

7 楼

also remember you need a "fi" as the end of testing structure

【在 t*******l 的大作中提到】

: thanks rhinoceros!
: 我又扩展了一下。如果/bbs/boards/family/里有吃，穿，住，用，行中的
: 若干项，是不是意味着要多几个if语句，以相同的格式？
: 我刚刚这样试了一下，不行:(
: #!/bin/sh
: cd bbs
: ls
: echo -n "Which directory you wanna browse:\t "
: read answer
: if [ -d $answer ]

r*s2002-09-08 07:09

8 楼

if condition1
then
command list if condition1 is true
[elif condition2
then command list if condition2 is true]
[else
command list if condition1 is false]
fi
FYI, the above shows the nested conditional structure.

【在 r********s 的大作中提到】

:
: also remember you need a "fi" as the end of testing structure

f*y2002-09-08 07:09

9 楼

yeah....
remove the line "read answer"
replace $answer, $answer2, $answer3 with $1, $2, $3...

【在 r********s 的大作中提到】

: if condition1
: then
: command list if condition1 is true
: [elif condition2
: then command list if condition2 is true]
: [else
: command list if condition1 is false]
: fi
: FYI, the above shows the nested conditional structure.