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Bash Script Example
Here is an example for a bash shell script that lists
all HTML files "*.html" in a directory and writes the
first line of each HTML-file to a file called File_Heads:
<![CDATA[
#!/bin/sh
# This is a comment
echo "List of files:"
ls -lA
FILE_LIST="`ls *.html`"
echo FILE_LIST: ${FILE_LIST}
RESULT=""
for file in ${FILE_LIST}
do
FIRST_LINE=`head -2 ${file}`
RESULT=${RESULT}${FIRST_LINE}
done
echo ${RESULT} | cat >FILE_HEADS
echo "'$RESULT' written Script done. "
]]>
Each line is a distinct command
--the commands are newline-separated.
You can also separate them with a semicolons.
Variables have no type.
An ordinary variable can be expanded
with $VARNAME or ${VARNAME}.
Single forward quotes ' protect the enclosed text from
shell interpretation. $() are an alternative notation.
Double quotes "" allow all shell interpretations inside them.
They are used to group text containing whitespace.
When a command is inside backward quotes `
its output is substituted in place of the back-quotes.