Hello I am trying to write unix script/command where I have to list out all filenames from given directory with filename format string-{number}.txt(eg: filename-1.txt,filename-2.txt) from which I have to form a json object. any pointers would be helpful.
[{
"filenumber": "1",
"name": "filename-1.txt"
},
{
"filenumber": "2",
"name": "filename-2.txt"
}
]
In the above json file-number should be read from {number} format of the each filename
Intuitively, I'd say you can do this with jq. However, in practice I've rarely been able to achieve what I wanted with jq :-)
With some lunch break puzzling, I've come up with this beauty:
ls | jq -R '{filenumber:input_line_number, name:.}' | jq -s .
Instead of ls you could use any other command that produces a newline separated list of strings.
jq will be the right tool then, you may need to write some code in a real programming language.A single call to jq should suffice :
shopt -s extglob
printf "%s\0" *-+([0-9]).txt | \
jq -sR 'split("\u0000") |
map({filenumber:capture(".*-(?<n>.*)\\.txt").n,
name:.})'
Very easy for the command-line JSON-parser xidel and its integrated EXPath File Module:
$ xidel -se 'array{for $x in file:list(.,false(),"*-[0-9]+.txt") return {"filenumber":extract($x,".*-(\d+)\.txt",1),"name":$x}}'
$ xidel -se '
array{
for $x in file:list(.,false(),"*-[0-9]+.txt")
return {
"filenumber":extract($x,".*-(\d+)\.txt",1),
"name":$x
}
}
'
I have tried with multiple examples to achieve exact use case of mine and finally found this working fine exactly how I wanted Thanks
for file in $(ls *.txt); do file_version=$(echo $file | sed 's/\(^.*-\)\(.*\)\(.txt.*$\)/\2/'); jq -n --arg name "$file_version" --arg path "$file" '{name: $name, name: $path}'; done | jq -n '.urls |= [inputs]'