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AWK in Shell and Bash Scripts Called in Crontab In brief: You need to put the backslash before variable: awk ‘{print \$3}’ AWK is the programming language that regularly used by admins to parse data from files, stdin, stdout. A common issue to use it, especially print function in shell/bash scripts. But … Continue reading AWK in Shell and Bash Scripts Called in Crontab
Running FTP server on unlix-like OS: ProFTPD server File Transfer Protocol (FTP) is a standard network protocol used to transfer files from one host to another host over a TCP-based network, such as the Internet or local nets. There are various ftp-services tou can run at your server among then proftpd, vsftpd, Pure-FTPd, ftpd(native, basic … Continue reading Running FTP server on unlix-like OS: ProFTPD server
All UNIX-like operating systems such as FreeBSD, Redhat, CentOS, Debian allows you to set environment variables. This variables are used by system applications. To find the current values of all your environment variables and functions you can any shell you’d like: sh, zsh, bash, etc… Below the list of system variables:
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PATH - Display lists directories the shell searches, for the commands. HOME - User's home directory to store files. TERM - Set terminal emulator being used by UNIX. PS1 - Display shell prompt in the Bourne shell and variants. MAIL - Path to user's mailbox. TEMP - Path to where processes can store temporary files. JAVA_HOME - Sun (now Oracle) JDK path. ORACLE_HOME - Oracle database installation path. TZ - Timezone settings PWD - Path to the current directory. HISTFILE - The name of the file in which command history is saved HISTFILESIZE -The maximum number of lines contained in the history file HOSTNAME -The system's host name LD_LIBRARY_PATH -It is a colon-separated set of directories where libraries should be searched for. USER -Current logged in user's name. DISPLAY -Network name of the X11 display to connect to, if available. SHELL -The current shell. TERMCAP - Database entry of the terminal escape codes to perform various terminal functions. OSTYPE - Type of operating system. MACHTYPE - The CPU architecture that the system is running on. EDITOR - The user's preferred text editor. PAGER - The user's preferred text pager. MANPATH - Colon separated list of directories to search for manual pages. |
Shell builtin commands … Continue reading UNIX: show system variables