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I'm trying to write a shell script that, when run, will set some environment variables that will stay set in the caller's shell.  setenv FOO foo   in csh/tcsh, or  export FOO=foo   in sh/bash only set it during the script's execution.  I already know that   source myscript   will run the commands of the script rather than launching a new shell, and that can result in setting the "caller's" environment.  But here's the rub:  I want this script to be callable from either bash or csh.  In other words, I want users of either shell to be able to run my script and have their shell's environment changed.  So 'source' won't work for me, since a user running csh can't source a bash script, and a user running bash can't source a csh script.  Is there any reasonable solution that doesn't involve having to write and maintain TWO versions on the script? How to create two classes in C++ which use each other as data? How to get permission number by string : -rw-r--r-- How to choose a circle for default stream in Google Plus? How can I choose a specific circle for the default stream in Google+ ? Many extensions don't work, and are not comfortable if using another PC. Java reflection: how to get field value from an object, not knowing its class How do I work recursively through a directory tree and execute a specific command on each file, and output the path, filename, extension, filesize and some other specific text to a single file in bash. Merging two files, one column at a time Volume control on asus zenbook 3 Using Ubuntu 16 LTS  I installed ubuntu on my new asus zenbook3 ux390. Nearly everything works fine except the volume controls don't work. The volume is either on or off. I can adjust volume in specific apps or websites (like youtube) successfully, but the internal volume control either wants to be muted or at 100%. In a modern SPFx Web Part, how do I check if a URL exists? Valid US visa on expired passport. Can I travel to the US? My old passport is in my maiden name and has already expired. My B1/B2 visa to travel to United States is still valid but is stamped in my old passport with my maiden name.   My new passport has my new name (old name got changed after marriage) but has details (like old passport number, father and mother's name) related to my old passport.    Will I be allowed to travel to US as long as I carry the my old as well as new passport?  Or Do I need to again get the visa stamped on my new passport? What is the difference of closing for duplicate and flagging for duplicate? When I encounter a duplicate, I have two choices: Vote closing because it is a duplicate, or flag it as a duplicate. What is the difference and should I do both? How to debug an unmet dependencies problem? Decode JWT Token in Apex Avoiding if statement inside a for loop? How to space columns evenly in a table with multicolumns? Miktex Package Installation I recently installed MiKTeX with the texmaker editor and cannot figure out how to update the packages. When I attempt to use the subfigure package with the following preamble  \documentclass[a4paper,12pt]{article} \usepackage[english]{babel} \usepackage{graphicx} \usepackage{subfigure}   I then get a prompt to install a new package, which I then set to the online directory at ctan. I then get the following error:   ! LaTeX Error: File `subfig.sty' not found.Type X to quit or &lt;RETURN&gt; to proceed,or enter new name. (Default extension: sty)Enter file name:! Emergency stop.&lt;read &gt;   How do I properly install packages to miktex? I'm absolutely confused. Thanks in advance for any help. How to pop-up alert to a user when he/she navigate away from page without saving the Records in custom visual force page? Cycle Normal Pass in Camera Space In this  to a question about a series, a theorem was stated:     If $A= \{a_i \}$ is a set such that $\sum_{i = 1}^{\infty} \frac{1}{a_i}$ converges, then $d(A) = 0$, where $d(A)$ is the  of the set.   My background in number theory is basically zero and all my attempts to prove this have been utterly unseccessful; would anyone please help me, or at least provide me with a hint to prove it? Java. Splitting a multiple word string into two word strings every space