meaning of `%1` in linux command `jobs`
linux
Solution
`%1` represents the process which you just started and backgrounded (`./crazy-malloc`, pid 2817). The command `jobs -x pmap %1` expands to `pmap 2817`.
The four columns in the output of `pmap` represent, respectively, the base address, size, permissions, and mapped file for each memory region mapped by your process.
Problem
I have seen the following script: ``` $ ./crazy-malloc & [1] 2817 malloced 3056 MB $ jobs -x pmap %1 2823: ./crazy-malloc 000cc000 4112K rw--- [ anon ] 004d0000 104K r-x-- /lib/ld-2.3.5.so 004ea000 4K r---- /lib/ld-2.3.5.so 004eb000 4K rw--- /lib/ld-2.3.5.so 004ee000 1168K r-x-- /lib/libc-2.3.5.so 00612000 8K r---- /lib/libc-2.3.5.so 00614000 8K rw--- /lib/libc-2.3.5.so 00616000 8K rw--- [ anon ] 006cf000 124388K rw--- [ anon ] 08048000 4K r-x-- /home/john/examples/mm/crazy-malloc 08049000 4K rw--- /home/john/examples/mm/crazy-malloc 08051000 2882516K rw--- [ anon ] b7f56000 125424K rw--- [ anon ] bfa43000 84K rw--- [ stack ] bfa58000 5140K rw--- [ anon ] ffffe000 4K ----- [ anon ] total 3142980K ``` Q1> what is the usage of the line `jobs -x pmap %1`? What does `%1` indicate here? jobs -x command [ args ... ] If the -x option is supplied, jobs replaces any jobspec found in command or args with the corre-sponding process group ID, and executes command passing it args, returning its exit status. pmap - report memory map of a process Q2> What the first two columns represent?