I see many examples and man pages on how to do operations like search-and-replace using sed. But, I want to match a given string or a regular pattern expression and display on the screen. How do I print lines with matching pattern using sed command only under Unix like operating systems?
How do I find out my DNS server IP address assiged my my ISP under Unix or Linux operating system using command prompt? How do I find preferred dns server under Debian / Ubuntu / Fedora Linux desktop system?
I often type the wrong command as follows under Linux bash shell:
rsync -av dir1 email@example.com:/path/to/dir1
cp -av file1*.txt file2*.txt /path/to/dest
I need to correct those command as follows:
rsync -av dir5 firstname.lastname@example.org:/path/to/dir1
cp -av delta1*.txt delta2*.txt /path/to/dest
How do I replace dir1 with dir5 or file with delta and repeat the last command under bash shell?
‘m running PHP version 5.3.3 on CentOS / RHEL 6.x with APC php-pecl-apc-3.1.9. However, I’m getting the following warnings in my php server log file
[01-Jul-2012 10:50:49] PHP Warning: require_once(): Unable to allocate memory for pool. in /var/www/html/includes/admin.php on line 57
[18-Jul-2012 17:00:08] PHP Warning: include_once(): Unable to allocate memory for pool. in //var/www/html/includes/xmlrpc.php on line 55
[18-Jul-2012 17:00:40] PHP Warning: require(): Unable to allocate memory for pool. in /var/www/html/includes/geshi.php on line 2307
How do I fix these php warnings?
I know wget command can resume downloads. H>ow do I resume partially transferred files using rsync command line under Unix like operating systems?
I‘m writing a bash wrapper script that will pass arguments to the command. I need to find out the last argument if I call the wrapper as follows:
./wrapper -a -b –longarg=foo thisfilename.txt
./wrapper -a -b thisfilename.txt
./wrapper -a –next=true thisfilename.txt
=> $@ is all of them.
=> $0 is script name.
=> $1 is first arg.
I want thisfilename.txt stored in a shell variable called $last. How do I find the last argument passed to a shell script written in bash or ksh under Unix like operating systems?