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How to tell if a string is not defined in a Bash shell script
...guish whether VAR is set but empty or not set, you can use:
if [ -z "${VAR+xxx}" ]; then echo VAR is not set at all; fi
if [ -z "$VAR" ] && [ "${VAR+xxx}" = "xxx" ]; then echo VAR is set but empty; fi
You probably can combine the two tests on the second line into one with:
if [ -z "$VAR" -a...
/usr/lib64/gcc/ ... /bin/ld: cannot find -lxxx 踩坑记录 - C/C++ - 清泛网 - 专注C/C++及内核技术
/usr/lib64/gcc/ ... /bin/ld: cannot find -lxxx 踩坑记录编译一个模块时依赖xxx模块，在确认依赖路径及依赖xxx so文件名均正确的前提下，编译仍然报错： usr lib64 gcc bin ld: cannot find -lxxx最后才发现，xxx目录生成的目 编译一个模块时依...
error: passing xxx as 'this' argument of xxx discards qualifiers
...n', 'https%3a%2f%2fstackoverflow.com%2fquestions%2f5973427%2ferror-passing-xxx-as-this-argument-of-xxx-discards-qualifiers%23new-answer', 'question_page');
}
);
Post as a guest
...
Environment variable substitution in sed
... diagnose. Potential problems:
You may need double quotes, as in sed 's/xxx/'"$PWD"'/'
$PWD may contain a slash, in which case you need to find a character not contained in $PWD to use as a delimiter.
To nail both issues at once, perhaps
sed 's@xxx@'"$PWD"'@'
...
RESTfully design /login or /register resources?
...m
POST /users records the entered information into database as a new /user/xxx
GET /users/xxx // gets and renders current user data in a profile view
POST /users/xxx // updates new information about user
These can be plural or singular (I'm not sure which one is correct). I've usually used /users...
Efficiently convert rows to columns in sql server
...NULL DROP TABLE ##ALL_Dimentions;
SELECT @SQL_Dimentions = 'SELECT [xxx_ID_xxx] = ROW_NUMBER() OVER (ORDER BY ' + @ListOfColumns_Dimension + '), ' + @ListOfColumns_Dimension
+ ' INTO ##ALL_Dimentions '
+ '...
How to export a mysql database using Command Prompt?
...name.sql.gz
You can then move this file between servers with:
scp user@xxx.xxx.xxx.xxx:/path_to_your_dump/filename.sql.gz your_detination_path/
(where xxx.xxx.xxx.xxx is the server IP address)
And then import it with:
gunzip filename.sql.gz | mysql -u [user] -p [password] [database]
...
GitHub - failed to connect to github 443 windows/ Failed to connect to gitHub - No Error
...ed by just using this command :-
>git config --global http.proxy XXX.XXX.XXX.XXX:ZZ
where XXX.XXX.XXX.XXX is the proxy server address
and ZZ is the port number of the proxy server.
There was no need to specify any username or password in my case.
...
Trying to SSH into an Amazon Ec2 instance - permission error
...u do not use the public DNS but rather the form
ssh -i your.pem root@ec2-XXX-XXX-XXX-XXX.z-2.compute-1.amazonaws.com
where the name is visible on your AMI panel
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multiple prints on the same line in Python
...can use the print statement to do this without importing sys.
def install_xxx():
print "Installing XXX... ",
install_xxx()
print "[DONE]"
The comma on the end of the print line prevents print from issuing a new line (you should note that there will be an extra space at the end of the out...
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