5 files changed, 0 insertions, 348 deletions
diff --git a/src/tools/README.md b/src/tools/README.md
index 41584d0..5dbb7f0 100644
--- a/src/tools/README.md
+++ b/src/tools/README.md
@@ -2,7 +2,6 @@
 
 - [tmux](./tmux.md)
 - [git](./git.md)
-- [awk](./awk.md)
 - [emacs](./emacs.md)
 - [gpg](./gpg.md)
 - [gdb](./gdb.md)
@@ -12,7 +11,4 @@
 - [pacman](./pacman.md)
 - [dot](./dot.md)
 - [ffmpeg](./ffmpeg.md)
-- [column](./column.md)
-- [sort](./sort.md)
-- [sed](./sed.md)
 - [gnuplot](./gnuplot.md)
diff --git a/src/tools/awk.md b/src/tools/awk.md
deleted file mode 100644
index d6f6c9c..0000000
--- a/src/tools/awk.md
+++ /dev/null
@@ -1,197 +0,0 @@
-# awk(1)
-
-```markdown
-awk [opt] program [input]
-    -F <sepstr>        field separator string (can be regex)
-    program            awk program
-    input              file or stdin if not file given
-```
-
-## Input processing
-
-Input is processed in two stages:
-1. Splitting input into a sequence of `records`.
-   By default split at `newline` character, but can be changed via the
-   builtin `RS` variable.
-2. Splitting a `record` into `fields`. By default strings without `whitespace`,
-   but can be changed via the builtin variable `FS` or command line option
-   `-F`.
-
-Fields are accessed as follows:
-- `$0` whole `record`
-- `$1` field one
-- `$2` field two
-- ...
-
-## Program
-
-An `awk` program is composed of pairs of the form:
-```markdown
-pattern { action }
-```
-The program is run against each `record` in the input stream. If a `pattern`
-matches a `record` the corresponding `action` is executed and can access the
-`fields`.
-
-```markdown
-INPUT
-  |
-  v
-record ----> ∀ pattern matched
-  |                   |
-  v                   v
-fields ----> run associated action
-```
-
-Any valid awk `expr` can be a `pattern`.
-
-An example is the regex pattern `/abc/ { print $1 }` which prints the first
-field if the record matches the regex `/abc/`. This form is actually a short
-version for `$0 ~ /abc/ { print $1 }`, see the regex comparison operator
-below.
-
-### Special pattern
-
-awk provides two special patterns, `BEGIN` and `END`, which can be used
-multiple times. Actions with those patterns are **executed exactly once**.
-- `BEGIN` actions are run before processing the first record
-- `END` actions are run after processing the last record
-
-### Special variables
-
-- `RS` _record separator_: first char is the record separator, by default
-  <newline>
-- `FS` _field separator_: regex to split records into fields, by default
-  <space>
-- `NR` _number record_: number of current record
-- `NF` _number fields_: number of fields in the current record
-
-### Special statements & functions
-
-- `printf "fmt", args...`
-
-  Print format string, args are comma separated.
-  - `%s` string
-  - `%d` decimal
-  - `%x` hex
-  - `%f` float
-
-  Width can be specified as `%Ns`, this reserves `N` chars for a string.
-  For floats one can use `%N.Mf`, `N` is the total number including `.` and
-  `M`.
-
-- `sprintf("fmt", expr, ...)`
-
-    Format the expressions according to the format string. Similar as `printf`,
-    but this is a function and return value can be assigned to a variable.
-
-- `strftime("fmt")`
-
-  Print time stamp formatted by `fmt`.
-  - `%Y` full year (eg 2020)
-  - `%m` month (01-12)
-  - `%d` day (01-31)
-  - `%F` alias for `%Y-%m-%d`
-  - `%H` hour (00-23)
-  - `%M` minute (00-59)
-  - `%S` second (00-59)
-  - `%T` alias for `%H:%M:%S`
-
-- `S ~ R`, `S !~ R`
-
-  The regex comparison operator, where the former returns true if the string
-  `S` matches the regex `R`, and the latter is the negated form.
-  The regex can be either a
-  [constant](https://www.gnu.org/software/gawk/manual/html_node/Regexp-Usage.html)
-  or [dynamic](
-  https://www.gnu.org/software/gawk/manual/html_node/Computed-Regexps.html)
-  regex.
-
-## Examples
-
-### Filter records
-```bash
-awk 'NR%2 == 0 { print $0 }' <file>
-```
-The pattern `NR%2 == 0` matches every second record and the action `{ print $0 }`
-prints the whole record.
-
-### Negative patterns
-```bash
-awk '!/^#/ { print $1 }' <file>
-```
-Matches records not starting with `#`.
-
-### Range patterns
-```bash
-echo -e "a\nFOO\nb\nc\nBAR\nd" | \
-    awk '/FOO/,/BAR/ { print }'
-```
-`/FOO/,/BAR/` define a range pattern of `begin_pattern, end_pattern`. When
-`begin_pattern` is matched the range is **turned on** and when the
-`end_pattern` is matched the range is **turned off**. This matches every record
-in the range _inclusive_.
-
-An _exclusive_ range must be handled explicitly, for example as follows.
-```bash
-echo -e "a\nFOO\nb\nc\nBAR\nd" | \
-    awk '/FOO/,/BAR/ { if (!($1 ~ "FOO") && !($1 ~ "BAR")) { print } }'
-```
-
-### Access last fields in records
-```bash
-echo 'a b c d e f' | awk '{ print $NF $(NF-1) }'
-```
-Access last fields with arithmetic on the `NF` number of fields variable.
-
-### Split on multiple tokens
-```bash
-echo 'a,b;c:d' | awk -F'[,;:]' '{ printf "1=%s | 4=%s\n", $1, $4 }'
-```
-Use regex as field separator.
-
-### Capture in variables
-```bash
-# /proc/<pid>/status
-#   Name:    cat
-#   ...
-#   VmRSS:   516 kB
-#   ...
-
-for f in /proc/*/status; do
-    cat $f | awk '
-             /^VmRSS/ { rss = $2/1024 }
-             /^Name/ { name = $2 }
-             END { printf "%16s %6d MB\n", name, rss }';
-done | sort -k2 -n
-```
-We capture values from `VmRSS` and `Name` into variables and print them at the
-`END` once processing all records is done.
-
-### Capture in array
-```bash
-echo 'a 10
-b 2
-b 4
-a 1' | awk '{
-    vals[$1] += $2
-    cnts[$1] += 1
-}
-END {
-    for (v in vals)
-        printf "%s %d\n", v, vals[v] / cnts [v]
-}'
-```
-Capture keys and values from different columns and some up the values.
-At the `END` we compute the average of each key.
-
-### Run shell command and capture output
-```bash
-cat /proc/1/status | awk '
-                     /^Pid/ {
-                        "ps --no-header -o user " $2 | getline user;
-                         print user
-                     }'
-```
-We build a `ps` command line and capture the first line of the processes output
-in the `user` variable and then print it.
diff --git a/src/tools/column.md b/src/tools/column.md
deleted file mode 100644
index 4a3b2c4..0000000
--- a/src/tools/column.md
+++ /dev/null
@@ -1,10 +0,0 @@
-# column(1)
-
-## Examples
-```sh
-# Show as table (aligned columns), with comma as delimiter from stdin.
-echo -e 'a,b,c\n111,22222,33' | column -t -s ','
-
-# Show file as table.
-column -t -s ',' test.csv
-```
diff --git a/src/tools/sed.md b/src/tools/sed.md
deleted file mode 100644
index 5b5f741..0000000
--- a/src/tools/sed.md
+++ /dev/null
@@ -1,102 +0,0 @@
-# sed(1)
-
-```
-sed [opts] [script] [file]
-  opts:
-    -i          edit file in place
-    -i.bk       edit file in place and create backup file
-                (with .bk suffix, can be specified differently)
-    --follow-symlinks
-                follow symlinks when editing in place
-    -e SCRIPT   add SCRIPT to commands to be executed
-                (can be specified multiple times)
-    -f FILE     add content of FILE to command to be executed
-
-    --debug     annotate program execution
-```
-
-## Examples
-### Delete lines
-```sh
-# Delete two lines.
-echo -e 'aa\nbb\ncc\ndd' | sed '1d;3d'
-# bb
-# dd
-
-# Delete last ($) line.
-echo -e 'aa\nbb\ncc\ndd' | sed '$d'
-# aa
-# bb
-# cc
-
-# Delete range of lines.
-echo -e 'aa\nbb\ncc\ndd' | sed '1,3d'
-# dd
-
-# Delete lines matching pattern.
-echo -e 'aa\nbb\ncc\ndd' | sed '/bb/d'
-# aa
-# cc
-# dd
-
-# Delete lines NOT matching pattern.
-echo -e 'aa\nbb\ncc\ndd' | sed '/bb/!d'
-# bb
-```
-
-### Insert lines
-```sh
-# Insert before line.
-echo -e 'aa\nbb' | sed '2iABC'
-# aa
-# ABC
-# bb
-
-# Insert after line.
-echo -e 'aa\nbb' | sed '2aABC'
-# aa
-# bb
-# ABC
-
-# Replace line.
-echo -e 'aa\nbb' | sed '2cABC'
-# aa
-# ABC
-
-# Insert before pattern match.
-echo -e 'aa\nbb' | sed '/bb/i 123'
-# aa
-# 123
-# bb
-```
-
-### Substitute lines
-```sh
-# Substitute by regex.
-echo -e 'aafooaa\ncc' | sed 's/foo/MOOSE/'
-# aaMOOSEaa
-# cc
-```
-
-### Multiple scripts
-```sh
-echo -e 'foo\nbar' | sed -e 's/foo/FOO/' -e 's/FOO/BAR/'
-# BAR
-# bar
-```
-
-### Edit inplace through symlink
-```sh
-touch file
-ln -s file link
-ls -l link
-# lrwxrwxrwx 1 johannst johannst 4 Feb  7 23:02 link -> file
-
-sed -i --follow-symlinks '1iabc' link
-ls -l link
-# lrwxrwxrwx 1 johannst johannst 4 Feb  7 23:02 link -> file
-
-sed -i '1iabc' link
-ls -l link
-# -rw-r--r-- 1 johannst johannst 0 Feb  7 23:02 link
-```
diff --git a/src/tools/sort.md b/src/tools/sort.md
deleted file mode 100644
index e74b490..0000000
--- a/src/tools/sort.md
+++ /dev/null
@@ -1,35 +0,0 @@
-# sort(1)
-
-```
-sort [opts] [file]
-  opts:
-    -r      reverse output
-    -b      ignore leading blanks
-
-    -n      sort by numeric
-    -h      sort by human numeric
-    -V      sort by version
-
-    -k<N>  sort by Nth key
-    -t<S>  field separator
-```
-
-## Examples
-```sh
-# Sort by directory sizes.
-du -sh * | sort -h
-```
-
-```sh
-# Sort numeric by second key.
-# The default key separator is non-blank to blank transition.
-echo 'a 4
-d 10
-c 21' | sort -k2 -n
-
-# Sort numeric by second key, split at comma.
-echo 'a,4
-d,10
-c,21' | sort -k2 -n -t,
-```
-> Use `--debug` to annotate part of the line used to sort and hence debug the key usage.