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http://dgd2010.blog.51cto.com/1539422/1542048
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string1==string2
-
string1=string2 -
True if the strings are equal. ‘=’ should be used with the
testcommand for POSIX conformance. -
string1!=string2 -
True if the strings are not equal.
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string1<string2 -
True ifstring1sorts beforestring2lexicographically.
-
string1>string2 -
True ifstring1sorts afterstring2lexicographically.
-
arg1OParg2 -
OPis one of ‘-eq’, ‘-ne’, ‘-lt’, ‘-le’, ‘-gt’, or ‘-ge’. These arithmetic binary operators return true ifarg1is equal to, not equal to, less than, less than or equal to, greater than, or greater than or equal toarg2, respectively.Arg1andarg2may be positive or negative integers.
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1
|
[[
"$1"
-
eq
""
]] &&
echo
"delete all spaces and comments of specialized file, using with $@ filename"
&&
exit
1
|
|
1
|
[[
"$1"
==
""
]] &&
echo
"delete all spaces and comments of specialized file, using with $@ filename"
&&
exit
1
|
|
1
2
3
4
|
#!/bin/bash
# delete all spaces and comments of specialized file, using with $@ filename
[[
"$1"
==
""
] &&
echo
"delete all spaces and comments of specialized file, using with $@ filename"
&&
exit
1
grep
-
v
\
# $1 | grep -v ^$
|
|
1
2
3
4
5
6
7
8
9
10
|
cat
> delsc.sh << eof
#!/bin/bash
# delete all spaces and comments of specialized file, using with $@ filename
[[
"\$1"
-==
""
]] &&
echo
"delete all spaces and comments of specialized file, using with \$@ filename"
&&
exit
1
grep
-
v
\
# \$1 | grep -v ^$
eof
chmod
+x .
/delsc
.sh
\
mv
delsc.sh
/usr/local/bin/delsc
which
delsc
cat
/usr/local/bin/delsc
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1
|
delsc filename
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