Braindump
Bash Single Quotes
Braindump.BashSingleQuotes History
Hide minor edits - Show changes to output
January 17, 2010, at 02:16 PM
by -
Changed lines 3-4 from:
'''Wrong''': @@$ echo 'The Hitchhiker\'s Guide to the Galaxy'@@ -- Won't work, as //within single quotes the escape is disabled//.
'''Richtig''': @@$ echo 'The Hitchhiker'\''s Guide to the Galaxy'@@ -- You have to first end the string (to re-enable escaping), then write the single quote and then get continue with your string.
'''Richtig''': @@$ echo 'The Hitchhiker'\''s Guide to the Galaxy'@@ -- You have to first end the string (to re-enable escaping), then write the single quote and then get continue with your string.
to:
!!! The wrong way
@@$ echo 'The Hitchhiker\'s Guide to the Galaxy'@@
This won't work, as //escaping is disabled within single quotes//.
!!! The right way
@@$ echo 'The Hitchhiker'\''s Guide to the Galaxy'@@
You have to first end the string (to re-enable escaping), then write the single quote and then continue with your string.
@@$ echo 'The Hitchhiker\'s Guide to the Galaxy'@@
This won't work, as //escaping is disabled within single quotes//.
!!! The right way
@@$ echo 'The Hitchhiker'\''s Guide to the Galaxy'@@
You have to first end the string (to re-enable escaping), then write the single quote and then continue with your string.
Changed lines 23-28 from:
'''Great use case''': Replace @@\'@@ through @@''@@ when converting MySQL scripts to Oracle SQL using @@sed@@: @@sed 's/\\'\''/'\'\''/' foo.sql@@
to:
!!! Great use case
Replace @@\'@@ through @@[=''=]@@ when converting MySQL scripts to Oracle SQL using @@sed@@:
@@sed 's/\\'\''/'\'\''/' foo.sql@@
Replace @@\'@@ through @@[=''=]@@ when converting MySQL scripts to Oracle SQL using @@sed@@:
@@sed 's/\\'\''/'\'\''/' foo.sql@@
January 17, 2010, at 02:06 PM
by -
Added lines 1-21:
!! Using single quotes inside of strings that are enclosed in single quotes
'''Wrong''': @@$ echo 'The Hitchhiker\'s Guide to the Galaxy'@@ -- Won't work, as //within single quotes the escape is disabled//.
'''Richtig''': @@$ echo 'The Hitchhiker'\''s Guide to the Galaxy'@@ -- You have to first end the string (to re-enable escaping), then write the single quote and then get continue with your string.
[@
$ echo 'The Hitchhiker'\''s Guide to the Galaxy'
The Hitchhiker's Guide to the Galaxy
$ # For the interpreter this looks as follows:
$ echo 'The Hitchhiker'\
> \'\
> 's Guide to the Galaxy'
@]
'''Great use case''': Replace @@\'@@ through @@''@@ when converting MySQL scripts to Oracle SQL using @@sed@@: @@sed 's/\\'\''/'\'\''/' foo.sql@@
[@
$ # Proof / Test for the call to sed:
$ echo "SELECT * FROM books WHERE title='The Hitchhiker\\'s Guide to the Galaxy'"
SELECT * FROM books WHERE title='The Hitchhiker\'s Guide to the Galaxy'
$ echo "SELECT * FROM books WHERE title='The Hitchhiker\\'s Guide to the Galaxy'" | sed 's/\\'\''/'\'\''/'
SELECT * FROM books WHERE title='The Hitchhiker''s Guide to the Galaxy'
@]
'''Wrong''': @@$ echo 'The Hitchhiker\'s Guide to the Galaxy'@@ -- Won't work, as //within single quotes the escape is disabled//.
'''Richtig''': @@$ echo 'The Hitchhiker'\''s Guide to the Galaxy'@@ -- You have to first end the string (to re-enable escaping), then write the single quote and then get continue with your string.
[@
$ echo 'The Hitchhiker'\''s Guide to the Galaxy'
The Hitchhiker's Guide to the Galaxy
$ # For the interpreter this looks as follows:
$ echo 'The Hitchhiker'\
> \'\
> 's Guide to the Galaxy'
@]
'''Great use case''': Replace @@\'@@ through @@''@@ when converting MySQL scripts to Oracle SQL using @@sed@@: @@sed 's/\\'\''/'\'\''/' foo.sql@@
[@
$ # Proof / Test for the call to sed:
$ echo "SELECT * FROM books WHERE title='The Hitchhiker\\'s Guide to the Galaxy'"
SELECT * FROM books WHERE title='The Hitchhiker\'s Guide to the Galaxy'
$ echo "SELECT * FROM books WHERE title='The Hitchhiker\\'s Guide to the Galaxy'" | sed 's/\\'\''/'\'\''/'
SELECT * FROM books WHERE title='The Hitchhiker''s Guide to the Galaxy'
@]