I think the way you’re doing it (an if statement with a condition using the $?VAR syntax, which evaluates to 1 if the variable is set, and 0 otherwise) is probably the most idiomatic csh construct that does what you want.
No. The output of a program never passes through the shell’s hands. Without redirection, it goes straight to the TTY. With redirection, it goes straight to whatever file or pipe it was directed to. The shell has no idea what the process sent to stdout/stderr.
The standard warnings regarding use of tcsh/csh apply (don’t use it for scripting, due to its inherent limitations), but here’s the translation: if ( “$1” == “” ) then # parentheses not strictly needed in this simple case echo “variable is empty” else echo “variable contains $1” endif Note, though, that if you were to … Read more
Find all the symbolic links in a directory: ls -l `find /usr/bin -maxdepth 1 -type l -print` For the listing of hidden files: ls -ald .*
Shelve the changes in the pending changelist, then run p4 describe -S -du 999
I have good experience with the following code. It doesn’t require any special user permissions: import resource, sys resource.setrlimit(resource.RLIMIT_STACK, (2**29,-1)) sys.setrecursionlimit(10**6) It does however not seem to work with pypy. If resource.setrlimit doesn’t work, you can also try using threads: sys.setrecursionlimit(10**6) import threading threading.stack_size(2**26) threading.Thread(target=main).start()
To remove newlines, use tr: tr -d ‘\n’ If you want to replace each newline with a single space: tr ‘\n’ ‘ ‘ The error ba: Event not found is coming from csh, and is due to csh trying to match !ba in your history list. You can escape the ! and write the command: … Read more
In csh, you can either try env: % env LD_LIBRARY_PATH=/foo/bar myprogram or, a subshell: % (setenv LD_LIBRARY_PATH /foo/bar; myprogram)
Try with: xargs –show-limits </dev/null Your environment variables take up 2446 bytes POSIX upper limit on argument length (this system): 2092658 POSIX smallest allowable upper limit on argument length (all systems): 4096 Maximum length of command we could actually use: 2090212 Size of command buffer we are actually using: 131072 There is no limit per … Read more
The csh shell has never been known for its extensive ability to manipulate file handles in the redirection process. You can redirect both standard output and error to a file with: xxx >& filename but that’s not quite what you were after, redirecting standard error to the current standard output. However, if your underlying operating … Read more