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Problems and solutions

Write a shell script in notepad under windwos. It's OK to run it under cygwin, but

There will be a problem when you run it under linux, which shows:

: bad interpreter:no such file or directory

The cause of the problem is the "line Terminator", unix/linux uses a newline character, while dos/windows makes

Use enter + line change

Solution:

1. Open the script using vi

two。 Set fileformat (ff)

: set ff=unix

3. Save

: w test.sh

At this point, test.sh can be executed under linux (pay attention to whether it can be executed before running)

Note: under cygwin, fileformat is either unix or dos

Example one: the performance of DOS format text file under Linux

Now there is a script file job.sh, which is edited with vi under Linux.

[root@jfht ~] # cat job.sh

#! / bin/sh

Date > job.txt

Now convert it to a DOS format text file.

[root@jfht ~] # unix2dos job.sh

Unix2dos: converting file job.sh to DOS format...

Try to run it.

[root@jfht ~] #. / job.sh

-bash:. / job.sh: insufficient permissions

[root@jfht ~] # chmod + x job.sh

[root@jfht ~] #. / job.sh

-bash:. / job.sh: / bin/ sh ^ M: bad interpreter: there is no such file or directory

Cannot be interpreted and executed in a script file in DOS format, because the first line of the script file is used to specify the interpretation

The Linux system thinks the interpreter is / bin/ sh ^ M, not / bin/sh.

Let's take a look at the true face of a file in DOS format through some commands under Linux.

[root@jfht ~] # cat-v job.sh job.txt ^ M

^ M

[root@jfht ~] # hexdump-C job.sh job.txt.... |

0000001e

[root@jfht ~] # vi job.sh job.txt

~

~

"job.sh" [dos] 4L, 30C

Now let's change the DOS format back to Unix format and see how it works.

Root@jfht ~] # dos2unix job.sh

Dos2unix: converting file job.sh to UNIX format...

[root@jfht ~] #. / job.sh

Can be executed, do not report "- bash:. / job.sh: / bin/ sh ^ M: bad interpreter: no"

That file or directory "this is wrong.

[root@jfht ~] #

Example two examples of the use of dos2unix-k and dos2unix-n

[root@jfht ~] # cat 1

> 2

> 3

> EOF

[root@jfht ~] # file 1.txt

1.txt: ASCII text

[root@jfht ~] # ls-l 1.txt

-rw-r--r-- 1 root root 6 11-14 09:08 1.txt

[root@jfht ~] # date

Sunday, November 14, 2010, 09:28:42 CST

[root@jfht] # unix2dos-k 1.txt

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