On 17Aug2018 00:17, Todd Chester <ToddAndMargo@xxxxxxxx> wrote:
grep and sed stopped working! I dnf re-installed them
both. No joy
What the heck (not my "actual" word)?
[...]
Next time this happens consider snapshotting the output at various points:
$ echo "a-b-c" | tee echo.out | ( set -x; sed -e 's/-//g' ) 2>sed-trace.out | tee sed.out
<nothing>
Then "od -c" the echo.out and sed-trace.out and sed.out files.
There's all sorts of possibilities, including the "-" not being an ASCII minus
and weird escape sequences hiding the output, not to mention possible stdio
bugs in sed or grep - I certainly came across one in GNU sed several years ago
for input data.
Just something to keep in mind for later.
Cheers,
Cameron Simpson <cs@xxxxxxxxxx>
$ echo "a-b-c" | sed -e 's/-//g'
<nothing>
Workaround:
$ echo "a-b-c" | perl -pe 's/-//g'
abc
$ echo "a-b-c" | perl6 -pe 's:g/\-//'
abc
$ ls -al /tmp | sed -n 3,4p
<nothing>
Workaround:
$ ls -al /tmp | perl6 -ne ".say if 3 <= ++$ <= 4"
dr-xr-xr-x. 19 root root 278 Apr 11 20:43 ..
drwxr--r--. 2 todd users 40 Aug 17 00:08 ARI
$ x=3; y=4; ls -al /tmp | perl6 -ne ".say if $x <= ++$ <= $y"
dr-xr-xr-x. 19 root root 278 Apr 11 20:43 ..
drwxr--r--. 2 todd users 40 Aug 17 00:08 ARI
# echo "abc" | grep "ab"
<nothing>
Work around:
$ echo "abc" | ack "ab"
abc
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