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- What are the special dollar sign shell variables? - Stack Overflow
In Bash, there appear to be several variables which hold special, consistently-meaning values For instance, myprogram amp;; echo $! will return the PID of the process which backgrounded myprog
- The UNIX® Standard | www. opengroup. org
The Single UNIX Specification is the standard in which the core interfaces of a UNIX OS are measured The UNIX standard includes a rich feature set, and its core volumes are simultaneously the IEEE Portable Operating System Interface (POSIX) standard and the ISO IEC 9945 standard
- unix - How to check permissions of a specific directory . . . - Stack . . .
In GNU Linux, try to use ls, namei, getfacl, stat For Dir [flying@lempstacker ~]$ ls -ldh tmp drwxrwxrwt 23 root root 4 0K Nov 8 15:41 tmp [flying@lempstacker ~]$ namei -l tmp f: tmp dr-xr-xr-x root root drwxrwxrwt root root tmp [flying@lempstacker ~]$ getfacl tmp getfacl: Removing leading ' ' from absolute path names # file: tmp # owner: root # group: root # flags: --t user::rwx
- bash - Shell equality operators (=, ==, -eq) - Stack Overflow
unix bash shell script equal comparison operator is not comparing 1 Equal and not equal operators not
- What does the line #! bin sh mean in a UNIX shell script?
When you try to execute a program in unix (one with the executable bit set), the operating system will look at the first few bytes of the file These form the so-called "magic number", which can be used to decide the format of the program and how to execute it #! corresponds to the magic number 0x2321 (look it up in an ascii table)
- How to convert DOS Windows newline (CRLF) to Unix newline (LF)
The solutions posted so far only deal with part of the problem, converting DOS Windows' CRLF into Unix's LF; the part they're missing is that DOS use CRLF as a line separator, while Unix uses LF as a line terminator The difference is that a DOS file (usually) won't have anything after the last line in the file, while Unix will
- unix - How to use echo command to print out content of a text file . . .
you could use echo command with cat as command substitution However, it will replace CR or return (unix: \n) with spaces: $ echo $(cat names txt) Homer Marge Bart Lisa Maggie Could be an interesting feature if you want to pipe to further data processing though E g replacing spaces with sed command
- In Unix, how do you remove everything in the current directory and . . .
First, if you look at the rm command man page (man rm under most Unix) you notice that –r means "remove the contents of directories recursively" So, doing rm -r alone would delete everything in the current directory and everything bellow it
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