Replacement by dictionary possible with AWK or Sed? [closed]

Answer 1

EDIT

This answers the original post. doesn't answer the multiple times edited and restructured question... on top of that I get a -1 from the OP who asked this question... Damn!

Yes, much simpler in awk :

This will print both column as the value for the second column :

awk '{print $2, $2}' file

If you want to flip first with second column:

awk '{print $2, $1}' file

Answer 2

$ awk 'NR==FNR{map[$1]=$2;next} { for (i=1;i<=NF;i++) $i=($i in map ? map[$i] : $i) } 1' fileA fileB
one one hello hallo two three hallo fem fem

Note that it will compress any chains of contiguous white space to a single blank char. Tell us if that is an issue.

Answer 3

if you have gnu sed, it supports script-file with -f:

`-f SCRIPT-FILE'
`--file=SCRIPT-FILE'
     Add the commands contained in the file SCRIPT-FILE to the set of
     commands to be run while processing the input.

you could write your substitutions in "c.sed" for example, then

sed -f c.sed file

example c.sed:

s/1/one/g
s/2/two/g
...

EDIT

just now you didn't tag the question with awk, sure, the awk one-liner would be simpler: (with your example)

awk '$1=$2' file

test:

kent$  echo "1 one
2 two 
3 three
four fyra
five fem"|awk '$1=$2'
one one
two two
three three
fyra fyra
fem fem

Answer 4

If ReplaceLeftWithRight_where_you_do_not_replace_things.txt contains pairs of string replacements, where any occurrence of the text in the first column should be replaced by the second column,

1 one
2 two 
3 three
four fyra
five fem

then this can trivially be expressed as a sed script.

s/1/one/g
s/2/two/g
s/3/three/g
s/four/fyra/g
s/five/fem/g

and you can trivially use sed to create this sed script:

sed 's%.*%s/&/g%;s% %/%' ReplaceLeftWithRight_where_you_do_not_replace_things.txt

then pass the output of that to a second instance of sed:

sed 's%.*%s/&/%;s% %/%' ReplaceLeftWithRight_where_you_do_not_replace_things.txt |
sed -f - someFile_Where_You_Replace_Things.txt

to replace all the matches in the file someFile_Where_You_Replace_Things.txt and have the output printed to standard output.

Sadly, not all sed dialects support the -f - option to read a script from standard input, but this should work at least on most Linuxes.

Sorry if I misunderstood your problem statement.