-bash/zsh: csh: command not found # Windows (WSL2) sudo apt-get update sudo apt-get install tcsh # Debian apt-get install tcsh # Ubuntu apt-get install tcsh # Alpine apk add tcsh # Arch Linux pacman -S tcsh # Kali Linux apt-get install tcsh # CentOS yum install tcsh # Fedora dnf install tcsh # OS X brew install tcsh # Raspbian apt-get install tcsh # Dockerfile dockerfile.run/csh # Docker docker run cmd.cat/csh csh
C shell，csh 是最早的 C 风格的 Unix shell 之一，由 Bill Joy 在 20 世纪 70 年代早期开发，最初用于 BSD Unix。
tcsh [-bcdefFimnqstvVxX] [-Dname[=value]] [arg ...] tcsh -l
-b Forces a ''break'' from option processing, causing any further shell arguments to be treated as non-option arguments. The remaining arguments will not be interpreted as shell options. This may be used to pass options to a shell script without confusion or possible subterfuge. The shell will not run a set-user ID script without this option. -c Commands are read from the following argument (which must be present, and must be a single argument), stored in the command shell variable for reference, and executed. Any remaining arguments are placed in the argv shell variable. -d The shell loads the directory stack from ~/.cshdirs as described under Startup and shutdown, whether or not it is a login shell. (+) -Dname[=value] Sets the environment variable name to value. (Domain/OS only) (+) -e The shell exits if any invoked command terminates abnormally or yields a non-zero exit status. -f The shell does not load any resource or startup files, or perform any command hashing, and thus starts faster. -F The shell uses fork(2) instead of vfork(2) to spawn processes. (+) -i The shell is interactive and prompts for its top-level input, even if it appears to not be a terminal. Shells are interactive without this option if their inputs and outputs are terminals. -l The shell is a login shell. Applicable only if -l is the only flag specified. -m The shell loads ~/.tcshrc even if it does not belong to the effective user. Newer versions of su(1) can pass -m to the shell. (+) -n The shell parses commands but does not execute them. This aids in debugging shell scripts. -q The shell accepts SIGQUIT (see Signal handling) and behaves when it is used under a debugger. Job control is disabled. (u) -s Command input is taken from the standard input. -t The shell reads and executes a single line of input. A '\' may be used to escape the newline at the end of this line and continue onto another line. -v Sets the verbose shell variable, so that command input is echoed after history substitution. -x Sets the echo shell variable, so that commands are echoed immediately before execution. -V Sets the verbose shell variable even before executing ~/.tcshrc. -X Is to -x as -V is to -v. --help Print a help message on the standard output and exit. (+) --version Print the version/platform/compilation options on the standard output and exit. This information is also contained in the version shell variable. (+) After processing of flag arguments, if arguments remain but none of the -c, -i, -s, or -t options were given, the first argument is taken as the name of a file of commands, or ''script'', to be executed. The shell opens this file and saves its name for possible resubstitution by '$0'. Because many systems use either the standard version 6 or version 7 shells whose shell scripts are not compatible with this shell, the shell uses such a 'standard' shell to execute a script whose first character is not a '#', i.e., that does not start with a comment.
csh 启动交互式 shell 会话：
启动 csh 交互式 shell 会话而不加载启动配置：
csh -c "echo 'csh is executed'"