02-26-2010
Bash script idea using cUrl -- possible?
I have an alias already in my .bash_profile to download files using cUrl's -o (output to file, user provides the file name) option. I find I'm using it quite a bit, so I wanted to write a script to run "curl -o", taking the necessary inputs - file name and URL from which to download - and then returning to a "parked" state like some python scripts I've seen do, ready to take in another filename and URL. The script should also, on reading a 'buzzword' (not "quit" -- that's too literal and it might be confused by the shell), put up one last echo and exit as normal.
Then my imagination kicked in and I started to wonder, also, if it wouldn't be possible to have the script log its own activity to an external file as soon as a download is complete, naming the file with the date and time created along with its own name or some generic 'tag' such as "curldl-activity-021810-223516H.txt", and keep logging to the same file until the exit word or phrase was entered.
I have a pretty firm idea of how to write the part of the script that takes in the name and URL and invokes cUrl to do the downloading. That would probably best be handled in a function, I'm thinking. I'm a bit sketchy on setting the conditional for an exit buzzword, and while I've written scripts and executed commands to send data to outside files, where to put such a command in this script is something I'm sure I've learned somewhere but can't recall, at any rate.
So again, here's me picking the brains of the gurus and asking for advice.
BZT
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LEARN ABOUT MOJAVE
jrunscript
jrunscript(1) General Commands Manual jrunscript(1)
NAME
jrunscript - command line script shell
SYNOPSIS
jrunscript [ options ] [ arguments... ]
PARAMETERS
options
Options, if used, should follow immediately after the command name.
arguments
Arguments, if used, should follow immediately after options or command name.
DESCRIPTION
jrunscript is a command line script shell. jrunscript supports both an interactive (read-eval-print) mode and a batch (-f option) mode of
script execution. This is a scripting language independent shell. By default, JavaScript is the language used, but the -l option can be
used to specify a different language. Through Java to scripting language communication, jrunscript supports "exploratory programming"
style.
NOTE: This tool is experimental and may not be available in future versions of the JDK.
OPTIONS
-classpath path
Specify where to find the user's .class files that are accessed by the script.
-cp path
This is a synonym for -classpath path
-Dname=value
Set a Java system property.
-Jflag
Pass flag directly to the Java virtual machine on which jrunscript is run.
-l language
Use the specified scripting language. By default, JavaScript is used. Note that to use other scripting languages, you also need to spec-
ify the corresponding script engine's jar file using -cp or -classpath option.
-e script
Evaluate the given script. This option can be used to run "one liner" scripts specified completely on the command line.
-encoding encoding
Specify the character encoding used while reading script files.
-f script-file
Evaluate the given script file (batch mode).
-f -
Read and evaluate a script from standard input (interactive mode).
-help
Output help message and exit.
-?
Output help message and exit.
-q
List all script engines available and exit.
ARGUMENTS
If [arguments...] are present and if no -e or -f option is used, then the first argument is the script file and the rest of the arguments,
if any, are passed as script arguments. If [arguments..] and -e or -f option are used, then all [arguments..] are passed as script argu-
ments. If [arguments..], -e and -f are missing, interactive mode is used. Script arguments are available to a script in an engine variable
named "arguments" of type String array.
EXAMPLES
Executing inline scripts
jrunscript -e "print('hello world')"
jrunscript -e "cat('http://java.sun.com')"
Use specified language and evaluate given script file
jrunscript -l js -f test.js
Interactive mode
jrunscript
js>print('hello world');
hello world
js>34 + 55
89
js> thread(function() { print('hello world'); }
hello world
js>
Run script file with script arguments
jrunscript test.js arg1 arg2 arg3
test.js is script file to execute and arg1, arg2 and arg3 are passed to script as script arguments. Script can access these using "argu-
ments" array.
SEE ALSO
If JavaScript is used, then before evaluating any user defined script, jrunscript initializes certain built-in functions and objects. These
JavaScript built-ins are documented in jsdocs.
06 Aug 2006 jrunscript(1)