tilde-expansion

问题 Assume someuser has a home directory /home/someuser NAME=someuser In bash - what expression to I use combining tilde (~) and $NAME to return the users home directory? HOMEDIRECTORY=~someuser echo $HOMEDIRECTORY /home/someuser NAME=someuser echo ~$NAME ~someuser any suggestions? 回答1: Safer : eval HOMEDIRECTORY="$(printf "~%q" "$NAME")" Here the %q option to printf quotes and escapes dangerous characters. If $NAME is joe, you'd get something like /home/joe . For root, you might get /root . For

问题 I'm able to awk this file directly from the command line but when I try to use it from my script it breaks. Not sure why. Heres my script #!/bin/bash ssh_config_path="~/.ssh/config" echo -n "Enter the username of the account you'd like to switch to > " read username awk ' !x{x=sub(/github-secondary/,"github.com")} !y{y=sub(/github\.com/,"github-secondary")} 1' $ssh_config_path 回答1: In quotes bash does not expand ~ . I suggest to use $HOME : ssh_config_path="$HOME/.ssh/config" 来源： https:/

问题 I am writing a simple bash script and wanted to display all the items in a a particular directory. I tried doing the following: desktop="~/Desktop/testr/" echo $desktop echo `ls $desktop` However I keep getting the output: ~/Desktop/testr/ ls: ~/Desktop/testr/: No such file or directory But when I run ls from the terminal, I can see the items. I suspect that the problem is that the ~ is not getting expanded but I thought that the double quotes would have taken care of that. Thanks for your

问题 I have a variable in my bash script whose value is something like this: ~/a/b/c Note that it is unexpanded tilde. When I do ls -lt on this variable (call it $VAR), I get no such directory. I want to let bash interpret/expand this variable without executing it. In other words, I want bash to run eval but not run the evaluated command. Is this possible in bash? How did I manage to pass this into my script without expansion? I passed the argument in surrounding it with double quotes. Try this

问题 This question already has answers here : Why isn't tilde (~) expanding inside double quotes? [duplicate] (1 answer) Tilde expansion in quotes (3 answers) Tilde in path doesn't expand to home directory (4 answers) Closed last year . I have made a directory ~/test_myDir I then run the following bash script: x="myDir" dirName="~/test_$x" cd $dirName echo "hey" > test.txt I get the following error: test.sh: line 5: cd: ~/test_myDir: No such file or directory I then remove the quotes from the

问题 This question already has answers here : Why isn't tilde (~) expanding inside double quotes? [duplicate] (1 answer) Tilde expansion in quotes (3 answers) Tilde in path doesn't expand to home directory (4 answers) Closed last year . I have made a directory ~/test_myDir I then run the following bash script: x="myDir" dirName="~/test_$x" cd $dirName echo "hey" > test.txt I get the following error: test.sh: line 5: cd: ~/test_myDir: No such file or directory I then remove the quotes from the

问题 I need to check whether a file in a user's home directory exists so use file check: if ( -e "~/foo.txt" ) { print "yes, it exists!" ; } Even though there is a file called foo.txt under the user's home directory, Perl always complains that there is no such file or directory. When I replace "~" with /home/jimmy (let's say the user is jimmy) then Perl give the right verdict. Could you explain why "~" dosen't work in Perl and tell me what is Perl's way to find a user's home directory? 回答1: ~ is a

问题 Say I have a folder called Foo located in /home/user/ (my /home/user also being represented by ~ ). I want to have a variable a="~/Foo" and then do cd $a I get -bash: cd: ~/Foo: No such file or directory However if I just do cd ~/Foo it works fine. Any clue on how to get this to work? 回答1: You can do (without quotes during variable assignment): a=~/Foo cd "$a" But in this case the variable $a will not store ~/Foo but the expanded form /home/user/Foo . Or you could use eval : a="~/Foo" eval cd

问题 How can I expand a path String with a tilde in Swift? I have a string like "~/Desktop" and I'd like to use this path with the NSFileManager methods, which requires the tilde to be expanded to "/Users/<myuser>/Desktop" . (This question with a clear problem statement doesn't exist yet, this should be easily findable. Some similar but not satisfying questions are Can not make path to the file in Swift, Simple way to read local file using Swift?, Tilde-based Paths in Objective-C) 回答1: Tilde

问题 Is it possible to add to the rules that bash uses for tilde expansion? I'd like to have ~data expand to /data/users/me, ~scratch expand to /data/scratch/me etc.. Is this possible, or does bash have too tight a tight hold on the '~'? Thanks, Andrew 回答1: Tilde expansion is tied to users' home directories (or the contents of the directory stack or $PWD or $OLDPWD ). Use variable expansion, aliases or functions to accomplish what you're after. You can also use CDPATH to list a set of directories