How to understand special character for line reading in bash shell?
I am still learning shell scripting. Recently I see a function for read configuration. But some of special character make me confused. I checked online to find answer. It was not successful. I post the code here to consult with expert or guru to get better understanding on these special characters such as:^[^#]*=,line%%=*,line#*=. how to understand the usage of these special character here. Thanks.
Code:
read_cfg()
{”‹
while read line; do”‹
if [[ "$line" =~ ^[^#]*= ]]; then”‹
l_parameter=`echo ${line%%=*} | tr -d ' '` l_value=`echo ${line#*=} | tr -d ' '`”‹
”‹
case "$l_parameter" in ”‹
"EMAIL_LIST" ) ”‹ #email list provided in command line overwrites the one in configuration file”‹
if [ -z "$g_bkp_email" ] ; then”‹
g_bkp_email=$l_value”‹
fi”‹
;;”‹
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Exactly this is what I would like to do :
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Discussion started by: arcoa05
5 Replies
LEARN ABOUT OSF1
line
line(1) General Commands Manual line(1)NAME
line - Reads one line from standard input
SYNOPSIS
line
STANDARDS
Interfaces documented on this reference page conform to industry standards as follows:
line: XCU5.0
Refer to the standards(5) reference page for more information about industry standards and associated tags.
OPTIONS
None
DESCRIPTION
The line command copies one line, up to and including a newline, from standard input and writes it to standard output. Use this command
within a shell command file to read from your terminal. The line command always writes at least a newline character.
NOTES
The line utility has no internationalization features and is marked LEGACY in XCU Issue 5. Use the read utility instead.
EXIT STATUS
Success. End-of-File.
EXAMPLES
To read a line from the keyboard and append it to a file, enter: echo 'Enter comments for the log:' echo ': c' line >>log
This shell procedure displays the message: Enter comments for the log:
It then reads a line of text from the keyboard and adds it to the end of the file log. The echo ': c' command displays a : (colon)
prompt. See the echo command for information about the c escape sequence.
SEE ALSO
Commands: echo(1), ksh(1), read(1), Bourne shell sh(1b), POSIX shell sh(1p)
Functions: read(2)
Standards: standards(5)line(1)