Check that your \ characters have no whitespace after them at the end of the line. This will cause BASH to not interpret the line wrap correctly, giving the rsync error above.
It goes like this: Servers are expensive, but users will give you processing time in their browsers for free. Therefore, server-side code is relatively expensive compared to client-side code on any site big enough to need to run more than one server. However, there are some things you can’t leave to the client, like data … Read more
For GNU sort: sort -k2M -k3n -k4 -k2M sorts by second column by month (this way “March” comes before “April”) -k3n sorts by third column in numeric mode (so that ” 9″ comes before “10”) -k4 sorts by the fourth column. See more details in the manual.
In a mongo script you can use the db.getSiblingDB(‘new_db_name’) to get a reference of a new database. So, it it not mandatory to give the database name in the command line. You can use the script.js: db = db.getSiblingDB(‘new_db_name’); print(db); // the rest of your code for database “new_db_name” and the output of this script … Read more
The answers that say to put $VAR in quotes are only correct by side effect. That is, when put in quotes, echo(1) receives a single argument of -e xyz, and since that is not a valid option string, echo just prints it out. It is a side effect as echo could just as easily print … Read more
From Bash Reference Manual: ${parameter:=word} If parameter is unset or null, the expansion of word is assigned to parameter. The value of parameter is then substituted. Positional parameters and special parameters may not be assigned to in this way. Basically it will assign the value of word to parameter if and only if parameter is … Read more
$? will contain the return code of some_command just as usual. Of course it might also contain a code from bash, in case something went wrong before your command could even be executed (wrong filename, whatnot).
I think it’s going to be difficult to get an objective comparison. I personally prefer Python. To address one of your criteria, Python was designed from the start to be an embeddable language. It has a very rich C API, and the interpreter is modularized to make it easy to call from C. If Java … Read more
Fanatics of all stripes should be questioned, no matter what topic they rave about. Data-driven decision tables are a perfectly good way to implement complex behavior. On the day it doesn’t scale or perform to your requirements, perhaps you’ll want to consider something else. I wouldn’t want to make a technology swap in working production … Read more
According to Add tack e x on your bash shebang | #!/bin/bash -ex Bash scripts can use various options on the shebang (#!/bin/bash). A more common one is: ‘#!/bin/bash -ex’. -e Exit immediately if a command exits with a non-zero status. -x Print commands and their arguments as they are executed. In short, adding -ex … Read more