Add cof, col, cop and con alias

README.md

@@ -66,6 +66,10 @@ git checkout:
   * [git cog](doc/git-cog/) = checkout --guess
   * [git cong](doc/git-cong/) = checkout --no-guess
   * [git cob](doc/git-cob/) = checkout -b
+  * [git cof](doc/git-cof/) - Switch to a branch's first commit hash
+  * [git col](doc/git-col/) = Switch to a branch's last commit hash
+  * [git cop](doc/git-cop/) = Switch to the previous (or previous N) commit hash
+  * [git con](doc/git-con/) = Switch to the next (or next N) commit hash
 
 git cherry-pick:
 
@@ -420,6 +424,10 @@ Use graphviz:
   * [git cog](doc/git-cog/) - Checkout with guessing
   * [git cong](doc/git-cong/) - Checkout with no guessing
   * [git cob](doc/git-cob/) - Create a new branch from the current working tree, and switch to it
+  * [git cof](doc/git-cof/) - Switch to a branch's first commit hash
+  * [git col](doc/git-col/) = Switch to a branch's last commit hash
+  * [git cop](doc/git-cop/) = Switch to the previous (or previous N) commit hash
+  * [git con](doc/git-con/) = Switch to the next (or next N) commit hash
   * [git commit-is-merge](doc/git-commit-is-merge/) - Is the commit a merge commit? If yes exit 0, else exit 1
   * [git commit-message-key-lines](doc/git-commit-message-key-lines/) - Show the commit's keyword-marker lines
   * [git commit-parents](doc/git-commit-parents/) - Show the commit's parents

doc/git-cof/README.md

@@ -0,0 +1,42 @@
+# git cof
+
+## Switch to a branch's first commit hash
+
+Git alias:
+
+```git
+cof = !"f() { \
+  REMOTE=\"$(git remote)\"; \
+  branch=\"${1:-$(git symbolic-ref \"refs/remotes/$REMOTE/HEAD\")}\"; \
+  git checkout $(git log --reverse --pretty=%H \"$branch\" | head -1); \
+};f"
+```
+
+Syntax:
+
+```shell
+git cof [branch name]
+```
+
+Options:
+
+  * branch name: default is the current branch name.
+
+Example: switch to the current branch's first commit hash:
+
+```shell
+git cof
+```
+
+Example: switch to the "foo" branch's first commit hash:
+
+```shell
+git cof foo
+```
+
+Compare:
+
+* [git cof](../git-cof): switch to a branch's first commit hash
+* [git col](../git-col): switch to a branch's last commit hash
+* [git cop](../git-cop): switch to the previous (or previous n) commit hash
+* [git con](../git-con): switch to the next (or next n) commit

doc/git-cof/index.md

@@ -0,0 +1,42 @@
+# git cof
+
+## Switch to a branch's first commit hash
+
+Git alias:
+
+```git
+cof = !"f() { \
+  REMOTE=\"$(git remote)\"; \
+  branch=\"${1:-$(git symbolic-ref \"refs/remotes/$REMOTE/HEAD\")}\"; \
+  git checkout $(git log --reverse --pretty=%H \"$branch\" | head -1); \
+};f"
+```
+
+Syntax:
+
+```shell
+git cof [branch name]
+```
+
+Options:
+
+  * branch name: default is the current branch name.
+
+Example: switch to the current branch's first commit hash:
+
+```shell
+git cof
+```
+
+Example: switch to the "foo" branch's first commit hash:
+
+```shell
+git cof foo
+```
+
+Compare:
+
+* [git cof](../git-cof): switch to a branch's first commit hash
+* [git col](../git-col): switch to a branch's last commit hash
+* [git cop](../git-cop): switch to the previous (or previous n) commit hash
+* [git con](../git-con): switch to the next (or next n) commit

doc/git-col/README.md

@@ -0,0 +1,42 @@
+# git col
+
+## Switch to a branch's last commit hash
+
+Git alias:
+
+```git
+col = !"f(){ \
+  REMOTE=\"$(git remote)\"; \
+  branch=\"${1:-$(git symbolic-ref \"refs/remotes/$REMOTE/HEAD\")}\"; \
+  git checkout $(git log -n 1 --pretty=%H \"$branch\"); \
+};f"
+```
+
+Syntax:
+
+```shell
+git col [branch name]
+```
+
+Options:
+
+  * branch name: default is the current branch name.
+
+Example: switch to the current branch's last commit hash:
+
+```shell
+git col
+```
+
+Example: switch to the "foo" branch's last commit hash:
+
+```shell
+git cof foo
+```
+
+Compare:
+
+* [git cof](../git-cof): switch to a branch's first commit hash
+* [git col](../git-col): switch to a branch's last commit hash
+* [git cop](../git-cop): switch to the previous (or previous n) commit hash
+* [git con](../git-con): switch to the next (or next n) commit

doc/git-col/index.md

@@ -0,0 +1,42 @@
+# git col
+
+## Switch to a branch's last commit hash
+
+Git alias:
+
+```git
+col = !"f(){ \
+  REMOTE=\"$(git remote)\"; \
+  branch=\"${1:-$(git symbolic-ref \"refs/remotes/$REMOTE/HEAD\")}\"; \
+  git checkout $(git log -n 1 --pretty=%H \"$branch\"); \
+};f"
+```
+
+Syntax:
+
+```shell
+git col [branch name]
+```
+
+Options:
+
+  * branch name: default is the current branch name.
+
+Example: switch to the current branch's last commit hash:
+
+```shell
+git col
+```
+
+Example: switch to the "foo" branch's last commit hash:
+
+```shell
+git cof foo
+```
+
+Compare:
+
+* [git cof](../git-cof): switch to a branch's first commit hash
+* [git col](../git-col): switch to a branch's last commit hash
+* [git cop](../git-cop): switch to the previous (or previous n) commit hash
+* [git con](../git-con): switch to the next (or next n) commit

doc/git-con/README.md

@@ -0,0 +1,43 @@
+# git branch-commit-first
+
+## Switch to the next (or next N) commit
+
+Git alias:
+
+```git
+con = !"f(){ \
+  REMOTE=\"$(git remote)\"; \
+  branch=\"${1:-$(git symbolic-ref \"refs/remotes/$REMOTE/HEAD\")}\"; \
+  n=\"${1:-1}\"; \
+  git switch --detach $(git log --reverse --pretty=%H \"$branch\" | grep -A $n $(git rev-parse HEAD) | tail -1); \
+};f"
+```
+
+Syntax:
+
+```shell
+git con [commit count]
+```
+
+Options:
+
+  * commit count: default is 1
+
+Example: Switch to the next commit of the current commit:
+
+```shell
+git con
+```
+
+Example: Switch to the next 4th commit of the current commit:
+
+```shell
+git con 3
+```
+
+Compare:
+
+* [git cof](../git-cof): switch to a branch's first commit hash
+* [git col](../git-col): switch to a branch's last commit hash
+* [git cop](../git-cop): switch to the previous (or previous n) commit hash
+* [git con](../git-con): switch to the next (or next n) commit

doc/git-con/index.md

@@ -0,0 +1,43 @@
+# git branch-commit-first
+
+## Switch to the next (or next N) commit
+
+Git alias:
+
+```git
+con = !"f(){ \
+  REMOTE=\"$(git remote)\"; \
+  branch=\"${1:-$(git symbolic-ref \"refs/remotes/$REMOTE/HEAD\")}\"; \
+  n=\"${1:-1}\"; \
+  git switch --detach $(git log --reverse --pretty=%H \"$branch\" | grep -A $n $(git rev-parse HEAD) | tail -1); \
+};f"
+```
+
+Syntax:
+
+```shell
+git con [commit count]
+```
+
+Options:
+
+  * commit count: default is 1
+
+Example: Switch to the next commit of the current commit:
+
+```shell
+git con
+```
+
+Example: Switch to the next 4th commit of the current commit:
+
+```shell
+git con 3
+```
+
+Compare:
+
+* [git cof](../git-cof): switch to a branch's first commit hash
+* [git col](../git-col): switch to a branch's last commit hash
+* [git cop](../git-cop): switch to the previous (or previous n) commit hash
+* [git con](../git-con): switch to the next (or next n) commit

doc/git-cop/README.md

@@ -0,0 +1,35 @@
+# git cop
+
+## Switch to the previous (or previous N) commit hash
+
+Git alias:
+
+```git
+cop = !"f(){ \
+  n=\"${1:-1}\"; \
+  git checkout HEAD~$n; \
+};f"
+```
+
+Syntax:
+
+```shell
+git cop [commit count]
+```
+
+Options:
+
+  * commit count: default is 1
+
+Example: switch to the previous 4th commit hash of the current commit:
+
+```shell
+git cop 4
+```
+
+Compare:
+
+* [git cof](../git-cof): switch to a branch's first commit hash
+* [git col](../git-col): switch to a branch's last commit hash
+* [git cop](../git-cop): switch to the previous (or previous n) commit hash
+* [git con](../git-con): switch to the next (or next n) commit

doc/git-cop/index.md

@@ -0,0 +1,35 @@
+# git cop
+
+## Switch to the previous (or previous N) commit hash
+
+Git alias:
+
+```git
+cop = !"f(){ \
+  n=\"${1:-1}\"; \
+  git checkout HEAD~$n; \
+};f"
+```
+
+Syntax:
+
+```shell
+git cop [commit count]
+```
+
+Options:
+
+  * commit count: default is 1
+
+Example: switch to the previous 4th commit hash of the current commit:
+
+```shell
+git cop 4
+```
+
+Compare:
+
+* [git cof](../git-cof): switch to a branch's first commit hash
+* [git col](../git-col): switch to a branch's last commit hash
+* [git cop](../git-cop): switch to the previous (or previous n) commit hash
+* [git con](../git-con): switch to the next (or next n) commit

doc/index.md

@@ -69,6 +69,10 @@ git checkout:
   * [git cog](git-cog/) = checkout --guess
   * [git cong](git-cong/) = checkout --no-guess
   * [git cob](git-cob/) = checkout -b
+  * [git cof](git-cof/) - Switch to a branch's first commit hash
+  * [git col](git-col/) = Switch to a branch's last commit hash
+  * [git cop](git-cop/) = Switch to the previous (or previous N) commit hash
+  * [git con](git-con/) = Switch to the next (or next N) commit hash
 
 git cherry-pick: