shell script EOF(End Of File) 사용하기

shell script EOF(End Of File) 사용하기

덮어쓰기(파일이 없으면 생성됨)

file1.txt

cat <<EOF > file1.txt
hello
world
EOF

$ cat file1.txt
hello
world

file2.txt

cat <<'EOF' | sed 's/l/e/g' > file2.txt
Hello
World
EOF

$ cat file2.txt 
Heeeo
Wored

file3.txt

cat > file3.txt <<EOF
hello
world
EOF

$ cat file3.txt        
hello
world

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추가(파일 끝에 붙이기)

file5.txt

cat <<EOF >> file5.txt      
hello
world
EOF

cat <<EOF >> file5.txt
hello
world
EOF

$ cat file5.txt         
hello
world
hello
world

file6.txt

cat >> file6.txt << EOF
hello
world
EOF

cat >> file6.txt << EOF
hello
world
EOF

$ cat file6.txt
hello
world
hello
world