On 2/17/24 6:40 AM, John Larew wrote:
This is a portion of a script that appears to be problematic. Each of these attempts appear to be valid; none of them work. The issue is apparent with bash in both termux v0.118.0/5.22.6 and Ubuntu v22.04.3 LTS/5.1.16 (see attached).
The clue is in the error message (and its subsequent variants):
fg: current: no such job
which means that there are no background jobs in the execution environment
where `fg' is executed.
The background job in constructs like
( sleep 15s; set -m; fg %+; exit) &
( sleep 15s; set -m; fg %%; exit) &
is in the parent shell's execution environment; the subshell has no
background jobs of its own.
In constructs like
( sleep 15s; set -m; fg $$; exit) &
( sleep 15s; set -m; fg $!; exit) &
`fg' doesn't take PID arguments. (The reason you get the `current' in the
error message is that $! expands to nothing if there haven't been any
background jobs created, and `fg' without arguments defaults to the current
job.)
--
``The lyf so short, the craft so long to lerne.'' - Chaucer
``Ars longa, vita brevis'' - Hippocrates
Chet Ramey, UTech, CWRU c...@case.edu http://tiswww.cwru.edu/~chet/
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