- #!/usr/bin/env bash
-
- ### Buffers and redirect ###
-
- #buffers 0=STDIN, 1=STDOUT, 2=STDERR, then 3 up to 9 are available for use
-
- #exec without command argument will redirect IO for current program e.g.
- #send stdout to /dev/null via file descriptor 9
- exec 9>/dev/null 1>&9
- #restore stdout so we can see it
- exec &>/dev/tty
-
- # example of redirect, get use to this //Gustav
- cat < my_file.txt > my_new_file.txt
-
- ### Man pages ###
-
- man #regular man pages
- help #for help bash
- apropos #search man pages (man)
-
- ### Symlinks and inodes ###
-
- readlink #shows symlink info, also see f flag
-
- #hardlink points to underlying inode so multiple can exist, and as long as any do exist the inode cannot be overwritten
- #hardlink cannot point to folder as this would create loops
- #however, symbolic (soft) links can point to folders since `readlink` shows the real path.
-
-
- #use `stat` to see amount of (hard) links to a file, and other such info
- stat
- readlink
- ln a b
- ln -s a b
-
- ### Bash shortcuts ###
-
- #0th argument of last command
- echo !:0
-
- #return from last command ("error code") for C errors see errno
- echo $?
-
-
- ### grep, sed, awk
-
- # grep, cut, wc can perform a lot of basic operations
- # sed seems to be good for a lot of things, e.g. search and replace stuff
- # example: find all headers (# ## ### etc) and add AS MANY # to the end of line
- # awk, a benefit here is that we can use variables and arrays to count and sum results, easily maintain data over multiple lines
-
- ### SED append corresponding nr of '#' ###
-
- #save starting '#' (at least 1) to group and append last to line
- #s/ for search and replace
- #\) group hits for later use as \1 and \2 ('#' and rest of text)
- #Note that spaces have a meaning for the matching
- #find rows starting with AT LEAST one '#' and save as first group, rest '.*' (all chars) to the end of row ($) save as second group. Finally the text is printed as \1 \2 \1, i.e. the starting '#' are repeated at the end.
-
- sed -i -E "s/^(#+)(.*)$/\1\2 \1/" example_doc.txt
- sed -i -E "s/^\(##*\)\(.*\)$/\1\2 \1/" example_doc.txt
-
-
- ### Find users with bash as shell ###
-
- #use cut to get first word before delimiter :
- grep "/bin/bash" /etc/passwd | cut -d \: -f 1
-
- #find lines ending with 'bash', each hit perform search and replace
- sed -E "/.*bash$/ { s/^(\w*).*$/\1/;p };d" < /etc/passwd
-
- #set separator ':', match regex, and print first string (before separator)
- awk -F: '/bash/{ print $1 }' < /etc/passwd
-
-
- ### Lines without word ###
-
- grep -v "daemon" /etc/group
-
- sed -E "/daemon/d" < /etc/group
-
- awk '!/daemon/' < /etc/group
-
-
- ### Count hits and show relevant lines ###
-
- #print matching lines numbers
- awk '/localhost/{print "Line " NR " matches"}' < /etc/hosts
-
- # Count nr of hits (i) and matching line numbers (NR)
- # TODO this seems broken!
- #awk '/localhost/{i=0}{i++} /localhost/{print "Line " NR " matches"} END {print i " hits"}' < /etc/hosts
-
-
- ### List files with numbers (exclude folders) ###
-
- #ls -p to list folders with / at the end
- ls -p /etc/ | grep -v ".*/$"| grep "[0-9]"
-
- ls -p /etc/ | awk "! /.*\/$/ && /[0-9]/"
-
- #delete lines ending in /, then print lines containing at least a number, delete all lines
- ls -p /etc/ |sed -E "/\/$/ d; /[0-9]/ p; d"
-
-
- ### SUM variables with awk ###
-
- #If third argument delimted by : only contains digits add it to sum
- awk -F ':' '$3 ~ /^[0-9]+$/ {sum+=$3} END {print sum}' < /etc/passwd
-
- ### AWK DIV ###
-
- #BEGIN {
- # # Things to be done before you start processing rows.
- #}
- #{
- # # Things to be done for each row.
- #}
- #END {
- # # Things to be done after processing the last row.
- #}
-
-
- ### Div ###
-
- #simple find exact filename
- ls /usr/share/doc -R | grep "^README$"
+#!/usr/bin/env bash
+
+#Copy file contents into Clipboard ("ctrl+c")
+xclip -sel c < file
+
+
+### Buffers and redirect ###
+
+#buffers 0=STDIN, 1=STDOUT, 2=STDERR, then 3 up to 9 are available for use
+
+#exec without command argument will redirect IO for current program e.g.
+#send stdout to /dev/null via file descriptor 9
+exec 9>/dev/null 1>&9
+#restore stdout so we can see it
+exec &>/dev/tty
+
+# example of redirect, get use to this //Gustav
+cat < my_file.txt > my_new_file.txt
+
+### Man pages ###
+
+man #regular man pages
+help #for help bash
+apropos #search man pages (man)
+
+### Symlinks and inodes ###
+
+readlink #shows symlink info, also see f flag
+
+#hardlink points to underlying inode so multiple can exist, and as long as any do exist the inode cannot be overwritten
+#hardlink cannot point to folder as this would create loops
+#however, symbolic (soft) links can point to folders since `readlink` shows the real path.
+
+
+#use `stat` to see amount of (hard) links to a file, and other such info
+stat
+readlink
+ln a b
+ln -s a b
+
+### Bash shortcuts ###
+
+#0th argument of last command
+echo !:0
+
+#return from last command ("error code") for C errors see errno
+echo $?
+
+
+### grep, sed, awk
+
+#the tools grep, sed, and awk are usually available on a Linux system and can be used for different purposes,
+ # although it's often a matter of taste.
+# These tools all use regular expressions (regex),
+ # awk - extended regex
+ # sed - regex (-E for extended)
+ # grep - regex (-E for extened)
+
+# grep together with the default programs in Linux (core utilities) can perform many basic operations
+ # grep, cut, wc, head, tail, strings, ...
+ # These can also be used together with sed, awk, or other tools
+# sed is good for a lot of things, especially text modification e.g. search and replace stuff
+ # example: find all headers (# ## ### etc) and add AS MANY # to the end of line
+# awk, can use more advanced statements as well as variables and arrays to count and sum results,
+ # thereby easily maintain data over multiple lines.
+ # awk also supports delimiters to further split the rows into smaller fields.
+
+
+####### The rest of this document shows examples of text manipulation #######
+
+
+### SED append corresponding nr of '#' ###
+
+#save starting '#' (at least 1) to group and append last to line
+#s/ for search and replace
+#\) group hits for later use as \1 and \2 ('#' and rest of text)
+#Note that spaces have a meaning for the matching
+#find rows starting with AT LEAST one '#' and save as first group,
+ # the rest '.*' (all chars) to the end of row ($) save as second group.
+ # Finally the text is printed as \1 \2 \1, i.e. the starting '#' are repeated at the end.
+
+sed -i "s/^\(##*\)\(.*\)$/\1\2 \1/" example_doc.txt
+
+#extended regex
+sed -i -E "s/^(#+)(.*)$/\1\2 \1/" example_doc.txt
+
+
+### Find users with bash as shell ###
+
+#use cut to get first word before delimiter :
+grep "/bin/bash" /etc/passwd | cut -d \: -f 1
+
+#find lines ending with 'bash', each hit perform search and replace
+sed -E "/.*bash$/ { s/^(\w*).*$/\1/;p };d" < /etc/passwd
+
+#set separator ':', match regex, and print first string (before separator)
+awk -F: '/bash/{ print $1 }' < /etc/passwd
+
+
+### Lines without word ###
+
+grep -v "daemon" /etc/group
+
+sed -E "/daemon/d" < /etc/group
+
+awk '!/daemon/' < /etc/group
+
+
+### Count hits and show relevant lines ###
+
+#print matching lines numbers
+awk '/localhost/{print "Line " NR " matches"}' < /etc/hosts
+
+# Count nr of hits (i) and matching line numbers (NR)
+# TODO this seems broken!
+#awk '/localhost/{i=0}{i++} /localhost/{print "Line " NR " matches"} END {print i " hits"}' < /etc/hosts
+
+
+### List files with numbers (exclude folders) ###
+
+#ls -p to list folders with / at the end
+ls -p /etc/ | grep -v ".*/$"| grep "[0-9]"
+
+ls -p /etc/ | awk "! /.*\/$/ && /[0-9]/"
+
+#delete lines ending in /, then print remaning lines which contains at least a number, delete all lines
+ls -p /etc/ | sed -E "/\/$/ d; /[0-9]/ p; d"
+
+
+### SUM variables with awk ###
+
+#If third argument delimted by : only contains digits add it to sum
+awk -F ':' '$3 ~ /^[0-9]+$/ {sum+=$3} END {print sum}' < /etc/passwd
+
+
+### AWK DIV ###
+
+#BEGIN {
+# # Things to be done before you start processing rows.
+#}
+#{
+# # Things to be done for each row.
+#}
+#END {
+# # Things to be done after processing the last row.
+#}
+
+
+### Div ###
+
+#simple find exact filename
+ls /usr/share/doc -R | grep "^README$"
projects / inbyggd-frihet-wiki.git / commitdiff