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What is rsync? Rsync is a program for synchronizing two directory trees across different file systems even if they are on different computers. It can run its host to host communications over ssh to keep things secure and to provide key based authentication. If a file is already present in the target and is the […] Linux provides the user’s to save the same data of a file with one or more different names in different places of a same partition in two ways : Hard Link Symbolic Link Hard link is a directory entry which is associated with a file on a file system The term is used to represent […] Singnals in Linux Terminate or send a signal with kill or killall # kill -s TERM 4712 ——– same as kill -15 4712 # killall -1 httpd ——– Kill HUP processes by exact name # pkill -9 http ——– Kill TERM processes by (part of) name # pkill -TERM -u www ——- Kill TERM processes […] This is useful to find out which file is blocking a partition which has to be unmounted and gives a typical error of: # umount /home/ umount: unmount of /home failed: Device busy umount impossible because a file is locking home Find opened files on a mount point with fuser or lsof: # fuser […] iostat / vmstat / mpstat are some tools to monitor server performance. * iostat reports CPU, disk I/O, and NFS statistics. * vmstat reports virtual memory statistics. * mpstat reports processors statictics. iostat Iostat without any argument displays information about the CPU usage, and I/O statistics about all the partitions […] mount -t iso9660 -o loop file.iso /mnt # Mount a CD image # mount -t ext3 -o loop file.img /mnt # Mount an image with ext3 fs # mount -o loop file.iso /mnt # extract an iso image to mnt Remount a device without unmounting it. # mount -o remount,ro / Copy the raw […] Full Name : Message-Digest algorithm 5 Usage : Using an MD5 checksum you can verify the integrity of data Algorithm : cryptographic hash function with a 128-bit value MD5 sum first identify the the data which is backup and then create a MD5 checksum which is combination of unique string of letters and numbers put […] sed ‘/./!d’ filename.txt > temp1.txt sed ‘/^$/d’ filename.txt > temp1.txt grep -v ‘^$’ filename.txt > temp1.txt Split on a 300mb example.zip file: #split -b 100mb example.zip It will generate 3 files with the following file sizes: 100MB xaa 100MB xab 100MB xac After split use: cat to combine a file #cat xa* > example-new.zip GNU tar (Tape ARchive) saves multiple files together into a single tape or disk archive, and can restore individual files from the archive. Here are some Linux tar Command with Useful Practical Examples Some useful command line switches are given below, which are used in this article. c => create an archive file. v => […] |
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