feh, hostname, fc, ssh-add: move to common (#6487)

pages/common/fc.md

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+# fc
+
+> Open the most recent command and edit it.
+> More information: <https://manned.org/fc>.
+
+- Open in the default system editor:
+
+`fc`
+
+- Specify an editor to open with:
+
+`fc -e {{'emacs'}}`
+
+- List recent commands from history:
+
+`fc -l`

pages/common/feh.md

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+# feh
+
+> Lightweight image viewing utility.
+> More information: <https://feh.finalrewind.org>.
+
+- View images locally or using a URL:
+
+`feh {{path/to/images}}`
+
+- View images recursively:
+
+`feh --recursive {{path/to/images}}`
+
+- View images without window borders:
+
+`feh --borderless {{path/to/images}}`
+
+- Exit after the last image:
+
+`feh --cycle-once {{path/to/images}}`
+
+- Set the slideshow cycle delay:
+
+`feh --slideshow-delay {{seconds}} {{path/to/images}}`
+
+- Set your wallpaper (centered, filled, maximized, scaled or tiled):
+
+`feh --bg-{{center|fill|max|scale|tile}} {{path/to/image}}`
+
+- Create a montage of all images within a directory. Outputs as a new image:
+
+`feh --montage --thumb-height {{150}} --thumb-width {{150}} --index-info "{{%nn%wx%h}}" --output {{path/to/montage_image.png}}`

pages/common/hostname.md

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+# hostname
+
+> Show or set the system's host name.
+> More information: <https://manned.org/hostname>.
+
+- Show current host name:
+
+`hostname`
+
+- Show the network address of the host name:
+
+`hostname -i`
+
+- Show all network addresses of the host:
+
+`hostname -I`
+
+- Show the FQDN (Fully Qualified Domain Name):
+
+`hostname --fqdn`
+
+- Set current host name:
+
+`hostname {{new_hostname}}`

pages/common/ssh-add.md

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+# ssh-add
+
+> Manage loaded ssh keys in the ssh-agent.
+> Ensure that ssh-agent is up and running for the keys to be loaded in it.
+
+- Add the default ssh keys in `~/.ssh` to the ssh-agent:
+
+`ssh-add`
+
+- Add a specific key to the ssh-agent:
+
+`ssh-add {{path/to/private_key}}`
+
+- List fingerprints of currently loaded keys:
+
+`ssh-add -l`
+
+- Delete a key from the ssh-agent:
+
+`ssh-add -d {{path/to/private_key}}`
+
+- Delete all currently loaded keys from the ssh-agent:
+
+`ssh-add -D`
+
+- Add a key to the ssh-agent and the keychain:
+
+`ssh-add -K {{path/to/private_key}}`