Re: [Help-bash] how to understand the xargs

[lina]

On Tuesday 27,December,2011 11:16 PM, Greg Wooledge wrote:
> On Tue, Dec 27, 2011 at 11:12:31PM +0800, lina wrote:
> > #!/bin/sh
> >
> > for i in {1..10} ; do
> Brace expansion is a bash feature, not a /bin/sh feature.  When you put
> #!/bin/sh at the top of your script, you are telling the operating system
> to use /bin/sh as the interpreter when you run the script.  And /bin/sh
> won't understand brace expansions.
>
> If you wish to use bash features in your scripts, you must use
>
> #!/bin/bash
>
> or
>
> #!/usr/bin/env bash
>
> as your shebang.  This will make the operating system run bash to interpret
> your script.
>
> > BTW, on script I used to use for i in $(seq 10)
> > just recent trying to learn more, so do some practice.
> seq(1) is Linux-only.  Some other OSes have jot(1) instead, but both of
> those are nonstandard (and they have incompatible syntax).
>
> The correct way to count to 10 in /bin/sh is:
>
> i=1
> while [ $i -le 10 ]; do
>    ...
>    i=$((i+1))
> done

Thanks, but


$ ./b.sh
./b.sh: 7: ./b.sh: i+1: not found
./b.sh: 5: [: -lt: unexpected operator

$ cat b.sh
#!/bin/sh

i=1

while [ $i -lt 10 ]; do

    i=$(i+1)

done

I don't know which parts is wrong.

Thanks again,