merge file text with file name
Solution 1
That's quite trivial with awk
:
$ awk '{print $0,FILENAME}' File*.txt
Apple File1.txt
Orange File1.txt
Banana File1.txt
monday File2.txt
tuesday File2.txt
wednesday File2.txt
If you want a tab rather than a space between the input line and the filename, add -v OFS='\t'
to the command-line to set the Output Field Separator (OFS):
awk -v OFS='\t' '{print $0,FILENAME}' File*.txt
or use:
awk '{print $0 "\t" FILENAME}' File*.txt
That's assuming file names don't contain =
characters. If you can't guarantee that the filenames won't contain =
characters, you can change that to:
awk '{print $0 "\t" substr(FILENAME, 3)}' ./File*.txt
Though with GNU awk
at least, you'd then get warnings if the name of the file contained bytes not forming valid characters (which you could work around by fixing the locale to C
(with LC_ALL=C awk...
) though that would also have the side effect of potentially changing the language of other error messages if any).
Solution 2
With perl
:
perl -lpe '$_ .= "\t$ARGV"' File*.txt
(note that it's fine with a glob like File*.txt
but could be dangerous with different ones).
Solution 3
For interactive use on the command line, one of the easiest things to type is
grep . File*.txt
Since the regex .
matches any character, every non-empty line of every file will match, and be printed with the filename as a prefix.
It's great for use-cases like checking some kernel settings that are stored with one setting per file:
$ grep . /sys/kernel/mm/transparent_hugepage/*
/sys/kernel/mm/transparent_hugepage/defrag:[always] defer defer+madvise madvise never
/sys/kernel/mm/transparent_hugepage/enabled:[always] madvise never
/sys/kernel/mm/transparent_hugepage/hpage_pmd_size:2097152
grep: /sys/kernel/mm/transparent_hugepage/khugepaged: Is a directory
/sys/kernel/mm/transparent_hugepage/shmem_enabled:always [within_size] advise never deny force
/sys/kernel/mm/transparent_hugepage/use_zero_page:1
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user247444
Updated on September 18, 2022Comments
-
user247444 almost 2 years
I have two text files. The first "file1.txt" has content:
Apple Orange Banana
while the second file "file2.txt" has content:
monday tuesday wednesday
I want to combine them into one file and its output is:
Apple File1.txt Orange File1.txt Banana File1.txt monday File2.txt tuesday File2.txt wednesday File2.txt
-
Alessio almost 7 yearsit's kind of annoying that gawk doesn't understand
--
as most other GNU programs do or have some other way of stopping it from interpreting=
in a filename asvar=value
. -
Stéphane Chazelas almost 7 yearsSee
grep -H . File*.txt
with GNUgrep
orgrep . /dev/null File*.txt
with other finds if the glob may expand to only one file (andgrep '^' File*.txt
to print empty lines as well). -
Stéphane Chazelas almost 7 years
gawk
does understand--
as end-of-options like all POSIX awk implementations (awk -- 'code' args
) but it doesn't stop arguments with=
from being treated as variable assignments. It hasawk -E file.awk args
for that though (so you can dogawk -e 'code' -E /dev/null other args x=y.txt File*.txt...
). But that's gawk-specific.