linux command to move part of string with non-printable character

Question

I have binary log file with such similar lines which splitted by non-printable char "^A".

I see this symbol backlit white when I open file with command "less"

blah9234^Azzz123^A1=123
blah6344^Azzz123^A1=456
blah4555^Azzz123^A1=78912

I need convert it to:

zzz123^A1=123^Ablah9234
zzz123^A1=456^Ablah6344
zzz123^A1=78912^Ablah4555

so I need take first part

blah9234

add non-printable symbol ^A

^Ablah9234

and put it into the and of line

zzz123^A1=123^Ablah9234

to start I've tried to add ^A to the beginning of the line:

sed 's/^.*blah/^Ablah/' my.log > new.log

but it just adds '^' and 'A' and I got:

^Ablah9234^Azzz123^A1=123

and first ^A doesn't backlit white in less viewer.

Any advice's would be helpful. Thanks.

This should work `sed 's/^$blah[^'$'\001'']\+$'$'\001''$.*$$/\2'$'\001''\1/' my.log > new.log` — alvits, Sep 06 '16 at 20:57
If you don't like multiple occurence of `$'\001'` you may use `sed $'s/^\$blah[^\001]\\+\$\001\$.*\$$/\\2\001\\1/' my.log > new.log`. — alvits, Sep 06 '16 at 21:03
Or if your `sed` supports extended expression, try `sed -r $'s/^(blah[^\001]+)\001(.*)$/\\2\001\\1/' my.log > new.log`. — alvits, Sep 06 '16 at 21:05
Pure bash `while IFS=$'\x01' read -r one two; do echo -e "${two}\x01${one}"; done < my.log > new.log`. — alvits, Sep 06 '16 at 21:17
Or `awk -F$'\x01' 'BEGIN{OFS="\x01"}{print $2,$3,$1}' filename.txt`... — twalberg, Sep 06 '16 at 21:21

score 2 · Answer 1 · edited May 23 '17 at 12:01

You can do this:

sed 's/^.*blah'$'\001''blah/' my.log > new.log

Or:

#get the value of the ^A control character
ctrlACode=$'\001'

#use it when we call sed
sed 's/^.*blah'"$ctrlACode"'blah/' my.log > new.log

_{To understand the second example, you need to understand this.
Basically, $'\0xx' is equal to the control character that has that value in octal. For instance, $'\000' is the NUL control character. $'\001' is ^A, the SOH control character, etc.}

An even easier way is found here.

In this way, you type ctrl-v then ctrl-a to insert ^A.

linux command to move part of string with non-printable character

1 Answers1