special-characters

I have a function which is executing a query on a table in SQLite database. I declare a constant: public static final String CANADA_HISTORY = "Canada's History"; . This is stored in a String variable let's say difficulty , I have one query: Cursor c = mDb.rawQuery("select * from Questions_answers where CHAPTERS = '"+difficulty+"'" , null); It is throwing an exception near the apostrophe. Logcat output: I/Database( 1170): sqlite returned: error code = 1, msg = near "s": syntax error D/AndroidRuntime( 1170): Shutting down VM W/dalvikvm( 1170): threadid=1: thread exiting with uncaught exception

Where can I find a list of allowed characters in filenames, depending on the operating system? (e.g. on Linux, the character : is allowed in filenames, but not on Windows) You should start with the Wikipedia Filename page. It has a decent-sized table ( Comparison of filename limitations ), listing the reserved characters for quite a lot of file systems. It also has a plethora of other information about each file system, including reserved file names such as CON under MS-DOS. I mention that only because I was bitten by that once when I shortened an include file from const.h to con.h and spent

Is there any comprehensive list of characters that need to be escaped in Bash? Can it be checked just with sed ? In particular, I was checking whether % needs to be escaped or not. I tried echo "h%h" | sed 's/%/i/g' and worked fine, without escaping % . Does it mean % does not need to be escaped? Was this a good way to check the necessity? And more general: are they the same characters to escape in shell and bash ? There are two easy and safe rules which work not only in sh but also bash . 1. Put the whole string in single quotes This works for all chars except single quote itself. To escape