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What is the default memory allocation for shell process by Linux , i mean is there any upper limit for shell process or any process.

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From man bashbuiltins:

ulimit [-HSTabcdefilmnpqrstuvx [limit]]

Provides control over the resources available to the shell and to processes started by it, on systems that allow such control.

Use ulimit -a to show current limits.

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Resource limits are generally controlled through ulimit (user-based) or sysctl (system-based).

For example, the kernel.shmmax parameter, set by sysctl defines the maximum size in bytes of a single shared memory segment that a Linux process can allocate in its virtual address space.

ulimit is used to set the limits of normal user processes. These values are usually configured in /etc/security/limits.conf as defaults, but can be changed on a per user / per session basis. They have both hard and soft limits.

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