Given two directory trees, how can I find out which files differ by content?
1277 Try: Or alternatively, with the short flags -qr: If you also want to see differences for files that may not exist in either directory:
linux
Opening a .tar.gz file with a single command
The letters are: x – extract z – gunzip the input f – Read from a file, not stdin
Extract file basename without path and extension in bash
You don’t have to call the external basename command. Instead, you could use the following commands: Note that this solution should work in all recent (post 2004) POSIX compliant shells, (e.g. bash, dash, ksh, etc.). Source: Shell Command Language 2.6.2 Parameter Expansion More on bash String Manipulations: http://tldp.org/LDP/LG/issue18/bash.html
Linux equivalent of I_PUSH
TIOCPKT is exactly what you want, according to the tty_ioctl(4) man page: the argument is a pointer to an integer which is non-zero to enable packet mode, or zero to disable it.
What is difference between arm64 and armhf?
armhf stands for “arm hard float”, and is the name given to a debian port for arm processors (armv7+) that have hardware floating point support. On the beaglebone black, for example: Although other commands (such as uname -a or arch) will just show armv7l The vfpv3 listed under Features is what refers to the floating point support. Incidentally, armhf, if your processor supports it, basically supersedes Raspbian, which … Read more
How can I kill a process by name instead of PID, on Linux?
More information: http://linux.about.com/library/cmd/blcmdl1_pkill.htm
where does stdio.o live in linux machine?
I’d suggest that you run gcc -v your_file.c. That will let you see exactly what commands your linker is using. You probably don’t have an stdio.o file to link against. Instead this is included in the C runtime library and the exact file will depend on your system configuration.
How to open some ports on Ubuntu?
I know little about Linux.Today I create a VPN server on My ubuntu according to https://github.com/philplckthun/setup-simple-ipsec-l2tp-vpn But when I finish the installation. I use my iphone to connect the ipsect vpn,bur it shows the VPN Server has no response. The github document shows Ports 1701, 500 and 4500 must be opened for the VPN to work! So … Read more
How to cat <> a file containing code?
You only need a minimal change; single-quote the here-document delimiter after <<. or equivalently backslash-escape it: Without quoting, the here document will undergo variable substitution, backticks will be evaluated, etc, like you discovered. If you need to expand some, but not all, values, you need to individually escape the ones you want to prevent. will produce … Read more
Creating a new directory in C
Look at stat for checking if the directory exists, And mkdir, to create a directory. You can see the manual of these functions with the man 2 stat and man 2 mkdir commands.