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How to check if a variable is set in Bash?
...e null | assign word |
| ${parameter:?word} | substitute parameter | error, exit | error, exit |
| ${parameter?word} | substitute parameter | substitute null | error, exit |
| ${parameter:+word} | substitute word | substitute null | substitute null |
| ${parameter+word} | ...
Why am I seeing “TypeError: string indices must be integers”?
...gt; mystring = 'helloworld'
>>> print mystring['stringindex']
TypeError: string indices must be integers
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Ubuntu running `pip install` gives error 'The following required packages can not be built: * freety
When performing pip install -r requirements.txt , I get the following error during the stage where it is installing matplotlib :
...
Equation (expression) parser with precedence?
...about 100 lines for the parser, 15 lines for a wrapper function) including error reporting, and comments.
You can find a live demo at http://users.telenet.be/bartl/expressionParser/expressionParser.html.
// operator table
var ops = {
'+' : {op: '+', precedence: 10, assoc: 'L', exec: function(l...
How to check if a Unix .tar.gz file is a valid file without uncompressing?
...the filesystem. If the tar file is corrupt, the process will abort with an error.
Example of failed tar ball test...
$ echo "this will not pass the test" > hello.tgz
$ tar -xvzf hello.tgz -O > /dev/null
gzip: stdin: not in gzip format
tar: Child returned status 1
tar: Error exit delayed from...
How to get the process ID to kill a nohup process?
...D of the last process executed). The 2 is the file descriptor for standard error (stderr) and 2>&1 tells the shell to route standard error output to the standard output (file descriptor 1). It requires &1 so that the shell knows it's a file descriptor in that context instead of just a fil...
Git push error '[remote rejected] master -> master (branch is currently checked out)'
... you will be able to perform git push to the remote repository without any errors.
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127 Return code from $?
...
127 - command not found
example: $caat
The error message will
bash:
caat: command not found
now you check using echo $?
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HTTP POST Returns Error: 417 “Expectation Failed.”
...ontinue = false;
Some servers choke on that header and send back the 417 error you're seeing.
Give that a shot.
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Some projects cannot be imported because they already exist in the workspace error in Eclipse
...ject that me and my co-worker have been working on.. and keep getting this error after I select-- "import" then "import existing project" then click archive file, and then I click next, and this error comes up:
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