Passing literal tab character from zsh to other program


 
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# 1  
Old 11-09-2017
Passing literal tab character from zsh to other program

I have a Zsh script which invokes another program. One of the paramters to be passed, should be a literal tab, i.e what in common programming languages is often written as "\t".

If it were bash, I think I could use the special form

Code:
$"\t"

but this doesn't seem to work (the called program sees a two-character string, backslash and t). I also tried putting octal code using $`010`, but no effect either (this is simply received as 010).

How can this be done in Zsh?
# 2  
Old 11-09-2017
As far as I remember, $"..." notation is for language translation purposes.

Simply using "\t" woks for me.

Code:
imac5k% cat s1
#!/usr/bin/env zsh
./s2 "	" # literal tab
./s2 "\t"
imac5k% cat s2
#!/usr/bin/env zsh
echo "\"$1\""

Code:
imac5k% ./s1
"	"
"	"

# 3  
Old 11-09-2017
In zsh try
Code:
$'\t'

instead of double quotes (which also works in bash).


--
@Scott, that is because of the echo statement. With printf it will print "\t"
These 2 Users Gave Thanks to Scrutinizer For This Post:
# 4  
Old 11-09-2017
"\t" works also with printf, but as $'\t' works, that's probably the way to go!
# 5  
Old 11-09-2017
Hi Scott, yes what I meant is when you use printf in the safe/usual way (without data in the format argument):
Code:
printf '"%s"\n' "$1"

# 6  
Old 11-09-2017
While $'\t' is easy to read and works in many current shells, it isn't in the standards yet and is not implemented by many shells in common use. Standard ways that should be supported by any shell based on Bourne shell syntax include:
Code:
utility_name "	" # where there is a literal tab character between the double-quote characters
utility_name '	' # where there is a literal tab character between the single-quote characters
utility_name "$(printf '\t')" # for modern shells
utility_name "$(printf '\011')" # for modern shells
utility_name "`printf '\t'`" # for 1980's vintage Bourne shells

and, of course, you can define a variable using any of those forms:
Code:
tab="	"
tab='	'
tab="$(printf '\t')"
tab="$(printf '\011')"
tab="`printf '\t'`"

and then use:
Code:
utility_name "$tab"

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