I'm a DOS beginner, and I want to start with batch files. I don't know whether it's easy to learn...
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中国DOS联盟论坛 » DOS学习入门 & 精彩文章 （教学室） » Do batch files execute completely in DOS command order?
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Posted 2003-11-15 00:00 · 中国 四川 成都 教育网
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Posted 2003-11-15 00:00 · 中国 湖北 武汉 江夏区 电信
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It's not hard.. Batch files execute in sequence according to the order you write them.
So each line in a batch command can only have one command..
So each line in a batch command can only have one command..
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Posted 2003-11-17 00:00 · 中国 江西 宜春 万载县 电信
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Posted 2003-11-19 00:00 · 中国 山东 烟台 联通
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Re zovusazm:
Similar to high-level compiled languages, batch processing also has three execution structures: sequential structure, loop structure, and selection structure.
In most batch file applications, the sequential structure is more common, that is, "execute in sequence according to the order you write them." Of course, for slightly more complex applications, selection structures like IF and loop structures like FOR are also used.
However, in advanced applications, the structure often used is GOTO, which is more or less the same as GOTO in BASIC. This is also a common structure in all interpreted languages. It is used to implement large-range loop structures or selection structures, that is, loops or selections spanning more than one line. For example:
Multi-statement form of selection IF:
IF == GOTO CHOOSE_A
IF == GOTO CHOOSE_B
:CHOOSE_A
REM statement block corresponding to choice A
GOTO END
:CHOOSE_B
REM statement block corresponding to choice B
GOTO END
:END
Multi-statement form of loop FOR:
SET CONIDITION=
SET BOUND=~~~~~~
REM This loop executes 5 times; the boundary above can be flexibly controlled as long as it meets the condition.
:LOOP
IF == GOTO END
REM statement block inside the loop.
SET CONIDITION=~%CONDITION%
:END
Similar to high-level compiled languages, batch processing also has three execution structures: sequential structure, loop structure, and selection structure.
In most batch file applications, the sequential structure is more common, that is, "execute in sequence according to the order you write them." Of course, for slightly more complex applications, selection structures like IF and loop structures like FOR are also used.
However, in advanced applications, the structure often used is GOTO, which is more or less the same as GOTO in BASIC. This is also a common structure in all interpreted languages. It is used to implement large-range loop structures or selection structures, that is, loops or selections spanning more than one line. For example:
Multi-statement form of selection IF:
IF == GOTO CHOOSE_A
IF == GOTO CHOOSE_B
:CHOOSE_A
REM statement block corresponding to choice A
GOTO END
:CHOOSE_B
REM statement block corresponding to choice B
GOTO END
:END
Multi-statement form of loop FOR:
SET CONIDITION=
SET BOUND=~~~~~~
REM This loop executes 5 times; the boundary above can be flexibly controlled as long as it meets the condition.
:LOOP
IF == GOTO END
REM statement block inside the loop.
SET CONIDITION=~%CONDITION%
:END
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Posted 2003-12-06 00:00 · 中国 广东 广州 教育网
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In batch processing, one line is not limited to one command.
For example,
a command1 & command2 & command3 ... (no matter whether the previous command fails, the following ones are still executed)
b command1 && command2 && command3....(the following ones are executed only if the previous command succeeds)
c command1 || command2|| command3.... (the following ones are executed only if the previous command fails)
These multi-command forms helped me solve some thorny problems!
There's also the pipe symbol for connecting front and back: | program1 | program2
Also, filtering:
command | find (search)
command |more (paged display)
command |sort (sort)
For example,
a command1 & command2 & command3 ... (no matter whether the previous command fails, the following ones are still executed)
b command1 && command2 && command3....(the following ones are executed only if the previous command succeeds)
c command1 || command2|| command3.... (the following ones are executed only if the previous command fails)
These multi-command forms helped me solve some thorny problems!
There's also the pipe symbol for connecting front and back: | program1 | program2
Also, filtering:
command | find (search)
command |more (paged display)
command |sort (sort)
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