\nYou do know the result of this:<\/p>\n
\na=A; echo $a<\/span><\/p><\/blockquote>\n
\nBut are you just as sure here?<\/div>\n\n<\/div>\n\na=A; b=B; echo $a.$b<\/span><\/p><\/blockquote>\n
\nThat depends on the shell, you are using. So I suggest you better write it this way:<\/div>\n<\/p>\n
\na=A; b=B; echo ${a}.${b}<\/span><\/p><\/blockquote>\n
\nEnclosing variable names in curly braces is quite often a good idea.<\/div>\n\n<\/div>\n\nLook at the following piece of code:<\/div>\n\ncase $var in<\/span><\/span><\/p><\/blockquote>\n
\n\u00a0\u00a0x*)<\/span><\/span><\/p><\/blockquote>\n
\n\u00a0\u00a0 \u00a0echo var starts with x<\/span><\/span><\/p><\/blockquote>\n
\n\u00a0\u00a0 \u00a0;;<\/span><\/span><\/p><\/blockquote>\n
\n\u00a0\u00a0*)<\/span><\/span><\/p><\/blockquote>\n
\n\u00a0\u00a0 \u00a0echo var starts with something else<\/span><\/span><\/p><\/blockquote>\n
\n\u00a0\u00a0 \u00a0;;<\/span><\/span><\/p><\/blockquote>\n
\nesac<\/span><\/span><\/p><\/blockquote>\n
\nLooks alright, doesn’t it?<\/div>\n\nNo, it’s does not. If that variable had not been assigned a value before or is of zero length, you will see an ugly syntax error occur.<\/div>\n\nTherefore enclose the variable in double quotes like here:<\/div>\n\n\ncase “$var” in<\/span><\/span><\/p><\/blockquote>\n
\n\u00a0\u00a0x*)<\/span><\/span><\/p><\/blockquote>\n
\n\u00a0\u00a0 \u00a0echo var starts with x<\/span><\/span><\/p><\/blockquote>\n
\n\u00a0\u00a0 \u00a0;;<\/span><\/span><\/p><\/blockquote>\n
\n\u00a0\u00a0*)<\/span><\/span><\/p><\/blockquote>\n
\n\u00a0\u00a0 \u00a0echo var starts with something else<\/span><\/span><\/p><\/blockquote>\n
\n\u00a0\u00a0 \u00a0;;<\/span><\/span><\/p><\/blockquote>\n
\nesac<\/span><\/span><\/p><\/blockquote>\n<\/div>\n