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  • Whats the difference between lt; lt;, lt; lt; lt; and lt; lt; in bash?
    Here-strings in bash are implemented via temporary files, usually in the format tmp sh-thd <random string>, which are later unlinked, thus making them occupy some memory space temporarily but not show up in the list of tmp directory entries, and effectively exist as anonymous files, which may still be referenced via file descriptor by the
  • bash - Shell equality operators (=, ==, -eq) - Stack Overflow
    The reason is that Bash is untyped The -eq causes the strings to be interpreted as integers if possible including base conversion: And 0 if Bash thinks it is just a string: So [[ "yes" -eq "no" ]] is equivalent to [[ 0 -eq 0 ]] Last note: Many of the Bash specific extensions to the Test Constructs are not POSIX and therefore may fail
  • bash - What does lt; lt; lt; mean? - Unix Linux Stack Exchange
    However in Bash, introducing a pipe means the individual commands are run in subshells Consider this: The output of the 2nd echo command prints just a single space Whaaaa? What happened to my variables? Because the read command is in a pipeline, it is run in a subshell It correctly reads 2 words from its stdin and assigns to the variables
  • An and operator for an if statement in Bash - Stack Overflow
    Modern shells such as Bash and Zsh have inherited this construct from Ksh, but it is not part of the POSIX specification If you're in an environment where you have to be strictly POSIX compliant, stay away from it; otherwise, it's basically down to personal preference
  • bash - How to run an alias in a shell script? - Ask Ubuntu
    Aliases are not present "in the system" They are present in a given shell process There is no way for a shell process to transmit its aliases to a child process The login shell source s several files from etc (the only one I remember is etc profile), in addition to profile and bashrc If you source the same files in your script, you'll have those aliases too
  • bash - What is the purpose of in a shell command? - Stack Overflow
    Furthermore, you also have || which is the logical or, and also ; which is just a separator which doesn't care what happend to the command before
  • What does the -e do in a bash shebang? - Unix Linux Stack Exchange
    All the bash command line switches are documented in man bash -e Exit immediately if a pipeline (which may consist of a single simple command), a subshell command enclosed in parentheses, or one of the commands executed as part of a command list enclosed by braces (see SHELL GRAMMAR above) exits with a non-zero status The shell does not exit if the command that fails is part of the command
  • How to increment a variable in bash? - Ask Ubuntu
    I found that on Bash 3 2 57, using declare -i x and then doing x+=1 in a loop (doing other thing), x did not increment more than one time The let and (()) methods worked fine
  • bash - What are the special dollar sign shell variables . . . - Stack . . .
    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





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