Prev: simple sed script
Next: POSIX compilant function call
From: jaredsubman on 19 Jun 2008 12:04
In bash, why does this form of tilde home directory expansion work
fine:

ls -ld ~joeuser

drwxr-xr-x 7 joeuser joeuser 512 Jun 11 11:03 /usr/home/joeuser/

yet, if I set the username to a variable, and try to use tilde
expansion, it never happens:

e.g.
USERNAME="joeuser"
ls -ld ~$USERNAME
ls: ~joeuser: No such file or directory

I've tried MANY variants of the above (including ls -ld ~{$USERNAME})
with no luck.

Any help would be much appreciated. Thanks in advance.
From: Dave B on 19 Jun 2008 12:15
jaredsubman(a)yahoo.com wrote:

> In bash, why does this form of tilde home directory expansion work
> fine:
>
> ls -ld ~joeuser
>
> drwxr-xr-x 7 joeuser joeuser 512 Jun 11 11:03 /usr/home/joeuser/
>
> yet, if I set the username to a variable, and try to use tilde
> expansion, it never happens:
>
> e.g.
> USERNAME="joeuser"
> ls -ld ~$USERNAME
> ls: ~joeuser: No such file or directory

That's probably because tilde expansion happens before variable expansion,
not after.
A solution is using eval:

eval ls -ld ~$USERNAME

as usual when using eval, be sure to always know what's inside USERNAME and
that it's a valid value.

--
echo 0|sed 's909=oO#3u)o19;s0#0ooo)].O0;s()(0bu}=(;s#}#.1m"?0^2{#;
s)")9v2@3%"9$);so%op]t(p$e#!o;sz(z^+.z;su+ur!z"au;sxzxd?_{h)cx;:b;
s/\(\(.\).\)\(\(..\)*\)\(\(.\).\)\(\(..\)*#.*\6.*\2.*\)/\5\3\1\7/;
tb'|awk '{while((i+=2)<=length($1)-18)a=a substr($1,i,1);print a}'
From: Sashi on 19 Jun 2008 12:39
> echo 0|sed 's909=oO#3u)o19;s0#0ooo)].O0;s()(0bu}=(;s#}#.1m"?0^2{#;
> s)")9v2@3%"9$);so%op]t(p$e#!o;sz(z^+.z;su+ur!z"au;sxzxd?_{h)cx;:b;
> s/\(\(.\).\)\(\(..\)*\)\(\(.\).\)\(\(..\)*#.*\6.*\2.*\)/\5\3\1\7/;
> tb'|awk '{while((i+=2)<=length($1)-18)a=a substr($1,i,1);print a}'

Does this signature have any meaning? I ran it by the bash prompt with
GNU sed and awk and it gave an error.
From: Dave B on 19 Jun 2008 12:40
Sashi wrote:
>> echo 0|sed 's909=oO#3u)o19;s0#0ooo)].O0;s()(0bu}=(;s#}#.1m"?0^2{#;
>> s)")9v2@3%"9$);so%op]t(p$e#!o;sz(z^+.z;su+ur!z"au;sxzxd?_{h)cx;:b;
>> s/\(\(.\).\)\(\(..\)*\)\(\(.\).\)\(\(..\)*#.*\6.*\2.*\)/\5\3\1\7/;
>> tb'|awk '{while((i+=2)<=length($1)-18)a=a substr($1,i,1);print a}'
>
> Does this signature have any meaning? I ran it by the bash prompt with
> GNU sed and awk and it gave an error.

Yes, it should work just fine. Just do copy/paste. What error do you get?

--
echo 0|sed 's909=oO#3u)o19;s0#0ooo)].O0;s()(0bu}=(;s#}#.1m"?0^2{#;
s)")9v2@3%"9$);so%op]t(p$e#!o;sz(z^+.z;su+ur!z"au;sxzxd?_{h)cx;:b;
s/\(\(.\).\)\(\(..\)*\)\(\(.\).\)\(\(..\)*#.*\6.*\2.*\)/\5\3\1\7/;
tb'|awk '{while((i+=2)<=length($1)-18)a=a substr($1,i,1);print a}'
From: Michael Tosch on 19 Jun 2008 13:54
jaredsubman(a)yahoo.com wrote:
> In bash, why does this form of tilde home directory expansion work
> fine:
>
> ls -ld ~joeuser
>
> drwxr-xr-x 7 joeuser joeuser 512 Jun 11 11:03 /usr/home/joeuser/
>
> yet, if I set the username to a variable, and try to use tilde
> expansion, it never happens:
>
> e.g.
> USERNAME="joeuser"
> ls -ld ~$USERNAME
> ls: ~joeuser: No such file or directory
>
> I've tried MANY variants of the above (including ls -ld ~{$USERNAME})
> with no luck.
>
> Any help would be much appreciated. Thanks in advance.

Either

HOMEDIR=~joeuser
ls -ld "$HOMEDIR"

or

USERNAME="joeuser"
eval ls -ld ~$USERNAME


--
echo imhcea\.lophc.tcs.hmo |
sed 's2\(....\)\(.\{5\}\)2\2\122;s1\(.\)\(.\)1\2\11g;1s;\.;::;2'
 | 
Pages: 1
Prev: simple sed script
Next: POSIX compilant function call