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Mount CD-ROM in Linux

How do I mount a CD-ROM or DVD drive on a Linux operating system using command line bash shell based options?
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CentOS / Redhat: Chroot And Mount Raid Or Actual Hard Disk From Rescue Kernel / CD

Something is wrong with my RHEL networking configuration so I booted using my ISPs remote rescue kernel mode to fix my system. How do I mount and chroot into actual installation to fix the problem? How do I boot from any Live Linux CD and chroot into /dev/sda1 or /dev/md0 to fix the problem or recover the data?
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Linux RAM Disk: Creating A Filesystem In RAM

Software RAM disks use the normal RAM in main memory as if it were a partition on a hard drive rather than actually accessing the data bus normally used for secondary storage such as hard disk. How do I create and store a web cache on a RAM disk to improve the speed of loading pages under Linux operating systems?
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Mount Command In UNIX

How do I use the mount command in UNIX to mount my file systems?
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Bash Shell: Replace a String With Another String In All Files Using sed and Perl -pie Options

How do I replace a string with another string in all files? For example, ~/foo directory has 100s of text file and I'd like to find out xyz string and replace with abc. I'd like to use sed or any other tool to replace all occurrence of the word.
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