I have a file of filenames, and I need to be able to get the size of these files using bash.
I have the following script which does that, but It prints the filename and the size on different lines, i'd prefer it to do it all on one line if possible.
#!/bin/sh
filename="$1"
while read -r line
do
name=$line
vars=(`echo $name | tr '.' ' '`)
echo $name
stat -x $name | grep Size: | awk '{ print $2 }'
done < "$filename"
I'd love to have it of the form:
filename: $size
How can I do this?
(I am using OSX hence the slightly odd version of stat.)
Pass -n to the echo to prevent a trailing newline from being added. So change
echo $name
to
echo -n $name
and to add the : separator between the file name and file size
echo -n ${name}": "
This should do the trick:
while read f
do
echo "${f} : $(stat -L -c %s ${f})"
done < "${filename}"
echo $name: $(stat -x $name | sed -n '/^Size:/s///p')
Related
I'm still new to the shell and need some help.
I have a file stapel_old.
Also I have in the same directory files like english_old_sync, math_old_sync and vocabulary_old_sync.
The content of stapel_old is:
english
math
vocabulary
The content of e.g. english is:
basic_grammar.md
spelling.md
orthography.md
I want to manipulate all files which are given in stapel_old like in this example:
take the first line of stapel_old 'english', (after that math, and so on)
convert in this case english to english_old_sync, (or after that what is given in second line, e.g. math to math_old_sync)
search in english_old_sync line by line for the pattern '.md'
And append to each line after .md :::#a1
The result should be e.g. of english_old_sync:
basic_grammar.md:::#a1
spelling.md:::#a1
orthography.md:::#a1
of math_old_sync:
geometry.md:::#a1
fractions.md:::#a1
and so on. stapel_old should stay unchanged.
How can I realize that?
I tried with sed -n, while loop (while read -r line), and I'm feeling it's somehow the right way - but I still get errors and not the expected result after 4 hours inspecting and reading.
Thank you!
EDIT
Here is the working code (The files are stored in folder 'olddata'):
clear
echo -e "$(tput setaf 1)$(tput setab 7)Learning directories:$(tput sgr 0)\n"
# put here directories which should not become flashcards, command: | grep -v 'name_of_directory_which_not_to_learn1' | grep -v 'directory2'
ls ../ | grep -v 00_gliederungsverweise | grep -v 0_weiter | grep -v bibliothek | grep -v notizen | grep -v Obsidian | grep -v z_nicht_uni | tee olddata/stapel_old
# count folders
echo -ne "\nHow much different folders: " && wc -l olddata/stapel_old | cut -d' ' -f1 | tee -a olddata/stapel_old
echo -e "Are this learning directories correct? [j ODER y]--> yes; [Other]-->no\n"
read lernvz_korrekt
if [ "$lernvz_korrekt" = j ] || [ "$lernvz_korrekt" = y ];
then
read -n 1 -s -r -p "Learning directories correct. Press any key to continue..."
else
read -n 1 -s -r -p "Learning directories not correct, please change in line 4. Press any key to continue..."
exit
fi
echo -e "\n_____________________________\n$(tput setaf 6)$(tput setab 5)Found cards:$(tput sgr 0)$(tput setaf 6)\n"
#GET && WRITE FOLDER NAMES into olddata/stapel_old
anzahl_zeilen=$(cat olddata/stapel_old |& tail -1)
#GET NAMES of .md files of every stapel and write All to 'stapelname'_old_sync
i=0
name="var_$i"
for (( num=1; num <= $anzahl_zeilen; num++ ))
do
i="$((i + 1))"
name="var_$i"
name=$(cat olddata/stapel_old | sed -n "$num"p)
find ../$name/ -name '*.md' | grep -v trash | grep -v Obsidian | rev | cut -d'/' -f1 | rev | tee olddata/$name"_old_sync"
done
(tput sgr 0)
I tried to add:
input="olddata/stapel_old"
while IFS= read -r line
do
sed -n "$line"p olddata/stapel_old
done < "$input"
The code to change only the english_old_sync is:
lines=$(wc -l olddata/english_old_sync | cut -d' ' -f1)
for ((num=1; num <= $lines; num++))
do
content=$(sed -n "$num"p olddata/english_old_sync)
sed -i "s/"$content"/""$content":::#a1/g"" olddata/english_old_sync
done
So now, this need to be a inner for-loop, of a outer for-loop which holds the variable for english, right?
stapel_old should stay unchanged.
You could try a while + read loop and embed sed inside the loop.
#!/usr/bin/env bash
while IFS= read -r files; do
echo cp -v "$files" "${files}_old_sync" &&
echo sed '/^.*\.md$/s/$/:::#a1/' "${files}_old_sync"
done < olddata/staple_old
convert in this case english to english_old_sync, (or after that what is given in second line, e.g. math to math_old_sync)
cp copies the file with a new name, if the goal is renaming the original file name from the content of the file staple_old then change cp to mv
The -n and -i flag from sed was ommited , include it, if needed.
The script also assumes that there are no empty/blank lines in the content of staple_old file. If in case there are/is add an addition test after the line where the do is.
[[ -n $files ]] || continue
It also assumes that the content of staple_old are existing files. Just in case add an additional test.
[[ -e $files ]] || { printf >&2 '%s no such file or directory.\n' "$files"; continue; }
Or an if statement.
if [[ ! -e $files ]]; then
printf >&2 '%s no such file or directory\n' "$files"
continue
fi
See also help test
See also help continue
Combining them all together should be something like:
#!/usr/bin/env bash
while IFS= read -r files; do
[[ -n $files ]] || continue
[[ -e $files ]] || {
printf >&2 '%s no such file or directory.\n' "$files"
continue
}
echo cp -v "$files" "${files}_old_sync" &&
echo sed '/^.*\.md$/s/$/:::#a1/' "${files}_old_sync"
done < olddata/staple_old
Remove the echo's If you're satisfied with the output so the script could copy/rename and edit the files.
When I try to extract rows that are matched string which are in another file.But the grep command returns nothing.
#!/bin/bash
input="export.txt"
file="filename.csv"
val=`head -n 1 $file`
echo $val>export.csv
cat export.txt | while read line
do
val=`echo $line | tr -d '\n'`
echo $val
valu=`grep $val $file`
echo $valu
done
You can simply do this :
grep -f list.txt input.txt
Which will extract all the lines from input which match any word from list.txt.
If for some reason you want to save each match, you can do it in a Bash array as :
IFS=$'\n' read -d '' -a values <<< "$( grep -f list.txt input.txt )"
And then you can print a certain match as :
echo "${values[1]}"
Regards!
I'm trying to put together a bash script that will search a bunch of files and if it finds a particular string in a file, it will add a new line on the line after that string and then move on to the next file.
#! /bin/bash
echo "Creating variables"
SEARCHDIR=testfile
LINENUM=1
find $SEARCHDIR* -type f -name *.xml | while read i; do
echo "Checking $i"
ISBE=`cat $i | grep STRING_TO_SEARCH_FOR`
if [[ $ISBE =~ "STRING_TO_SEARCH_FOR" ]] ; then
echo "found $i"
cat $i | while read LINE; do
((LINENUM=LINENUM+1))
if [[ $LINE == "<STRING_TO_SEARCH_FOR>" ]] ; then
echo "editing $i"
awk -v "n=$LINENUM" -v "s=new line to insert" '(NR==n) { print s } 1' $i
fi
done
fi
LINENUM=1
done
the bit I'm having trouble with is
awk -v "n=$LINENUM" -v "s=new line to insert" '(NR==n) { print s } 1' $i
if I just use $i at the end, it will output the content to the screen, if I use $i > $i then it will just erase the file and if I use $i >> $i it will get stuck in a loop until the disk fills up.
any suggestions?
Unfortunately awk dosen't have an in-place replacement option, similar to sed's -i, so you can create a temp file and then remove it:
awk '{commands}' file > tmpfile && mv tmpfile file
or if you have GNU awk 4.1.0 or newer, the -i inplace is added, so you can do:
awk -i inplace '{commands}' file
to modify the original
#cat $i | while read LINE; do
# ((LINENUM=LINENUM+1))
# if [[ $LINE == "<STRING_TO_SEARCH_FOR>" ]] ; then
# echo "editing $i"
# awk -v "n=$LINENUM" -v "s=new line to insert" '(NR==n) { print s } 1' $i
# fi
# done
# replaced by
sed -i 's/STRING_TO_SEARCH_FOR/&\n/g' ${i}
or use awk in place of sed
also
# ISBE=`cat $i | grep STRING_TO_SEARCH_FOR`
# if [[ $ISBE =~ "STRING_TO_SEARCH_FOR" ]] ; then
#by
if [ $( grep -c 'STRING_TO_SEARCH_FOR' ${i} ) -gt 0 ]; then
# if file are huge, if not directly used sed on it, it will be faster (but no echo about finding the file)
If you can, maybe use a temporary file?
~$ awk ... $i > tmpfile
~$ mv tmpfile $i
Or simply awk ... $i > tmpfile && mv tmpfile $i
Note that, you can use mktemp to create this temporary file.
Otherwise, with sed you can insert a line right after a match:
~$ cat f
auie
nrst
abcd
efgh
1234
~$ sed '/abcd/{a\
new_line
}' f
auie
nrst
abcd
new_line
efgh
1234
The command search if the line matches /abcd/, if so, it will append (a\) the line new_line.
And since sed as the -i to replace inline, you can do:
if [[ $ISBE =~ "STRING_TO_SEARCH_FOR" ]] ; then
echo "found $i"
echo "editing $i"
sed -i "/STRING_TO_SEARCH_FOR/{a
\new line to insert
}" $i
fi
This is my code
title=""
line=""
fname=$1
numoflines=$(wc -l < $fname)
for ((i=2 ; i<=$numoflines ; i++))
do
...
done
In the for loop i want to print the first word of every line into $title
and the rest of the line without the first word into $line
(using bash)
tnx
I am assuming that by print to a variable you mean add the contents of each line to the variable. To do this, you can use the bash built-in function read:
while read -r t l; do title+="$t"; line+="$l"; done < "$fname"
This will add the first word of every line to $title and the rest of the line to $line.
You can do some like this:
echo "$fname"
This is my line.
My cat is green.
title=$(awk '{print $1}' <<< "$fname")
line=$(awk '{$1="";sub(/^ /,"")}1' <<< "$fname")
echo "$title"
This
My
echo "$line"
is my line.
cat is green.
Alternative approach using the cut command:
file="./myfile.txt"
title=$(cut -f1 -d ' ' "$file")
line=$(cut -f2- -d ' ' "$file")
#check print
pr -tm <(echo -e "TITLES\n$title") <(echo -e "LINES\n$line")
for the next myfile.txt
My cat is green.
Green cats are strange.
prints
TITLES LINES
My cat is green.
Green cats are strange.
do
Tempo="$( sed -n "${i} {s/^[[:blank:]]*\([^[:blank:]]*\)[[:blank:]]*\(.*\)/title='\1';line='\2'/p;q;}" ${fname} )"
eval "${Tempo}"
done
# or
do
sed -n "${i} {p;q;}" | read Line Title
# but this does not keep content available on each OS/shell
done
How can I tokenize $PATH by using awk?
I tried 3 hours, but it totally screwed out.
#!/bin/bash
i=1
while true; do
token=$($echo $PATH | awk -F ':' '{print $"$i"}')
if [ -z "$token" ]; then
break
fi
((i++))
if [ -a "$TOKEN/$1" ]; then
echo "$TOKEN/$1"
break
fi
break
done
When I run this code, I got
/home/$USERID/bin/ff: line 6: /home/$USERID/bin:/usr/local/symlinks:/usr/local/scripts:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/home/$USERID/bin: No such file or directory
How can I change my program?
What are you trying to do?
This will let you iterate against the individual paths:
echo $PATH | tr ':' '\n' | while read line; do echo $line; done
As #SiegeX notes, an even shorter version works
echo $PATH | while read -d ':' line; do echo $line; done
Do the whole thing in awk
#!/bin/bash
awk -v addPath="$1" 'BEGIN{RS=":";ORS=addPath "\n"}{$1=$1}1' <<< $PATH
Proof of Concept
$ addPath="/foo"
$ awk -v addPath="$addPath" 'BEGIN{RS=":";ORS=addPath "\n"}{$1=$1}1' <<< $PATH
/usr/local/bin/foo
/usr/bin/foo
/bin/foo
/usr/games/foo
/usr/lib/java/bin/foo
/usr/lib/qt/bin/foo
/usr/share/texmf/bin/foo
./foo
/sbin/foo
/usr/sbin/foo
/usr/local/sbin/foo
I think simple tr : \\n would suffice. Pipe it with sed 's#$#blabla#g' to add something to the lines and that's it.
You don't need to use external tools such as awk or tr to tokenize the PATH. Bash is capable of doing so:
#!/bin/sh
IFS=:
for p in $PATH
do
if [ -a "$p/$1" ]; then
echo "$p/$1"
break
fi
done
The IFS is a bash built-in variable which bash use as an input field separator (IFS).